Chris Cleveland

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1 – 50 of 2,101

Problem 60977. Linear primes p' = mp + n

Created by: Nicolas Douillet

Tags math, primes, integers

2

Solutions

67

Size

2

Solutions

67

Size

Problem 60953. Chek the Delta = p' - p = 6k gap theorem about arithmetic progressions in the prime number set

Created by: Nicolas Douillet

Tags math, primes, distance

1

Solution

148

Size

1

Solution

148

Size

Problem 60976. List the complementary / symetric prime couples

Created by: Nicolas Douillet

Tags math, primes, integers

1

Solution

59

Size

1

Solution

59

Size

Problem 60967. List primes which are the sum of two consecutive lower primes plus minus one

Created by: Nicolas Douillet

Tags math, primes, integers

2

Solutions

72

Size

2

Solutions

72

Size

Problem 60971. List the twin prime couples

Created by: Nicolas Douillet

Tags math, primes, integers

1

Solution

47

Size

1

Solution

47

Size

Problem 60975. Check Legendre's conjecture

Created by: Nicolas Douillet

Tags math, square, primes

1

Solution

48

Size

1

Solution

48

Size

Problem 60972. Check Bertrand-Chebyshev's theorem about prime numbers

Created by: Nicolas Douillet

Tags math, primes, integers

1

Solution

35

Size

1

Solution

35

Size

Problem 60970. Check p = 6n +/- 1, the generic formula for odd prime numbers greater than 3

Created by: Nicolas Douillet

Tags math, primes, integers

1

Solution

65

Size

1

Solution

65

Size

Problem 60969. Check p = 4n +/- 1, the generic formula for odd prime numbers

Created by: Nicolas Douillet

Tags math, primes, integers

1

Solution

58

Size

1

Solution

58

Size

Problem 60965. List the near-square primes, p = n² + 1 (Landau's 4th problem)

Created by: Nicolas Douillet

Tags math, square, primes

1

Solution

46

Size

1

Solution

46

Size

Problem 46594. Create a sequence of primes p such that p > n π(p)

Created by: ChrisR

Tags primes, sequence

6

Solutions

82

Size

6

Solutions

82

Size

Problem 46050. Construct a prime circle

Created by: ChrisR

Tags primes

1

Solution

196

Size

1

Solution

196

Size

Problem 47950. Test the generalized Legendre conjecture

Created by: ChrisR

Tags primes, conjecture

8

Solutions

86

Size

8

Solutions

86

Size

Problem 48075. Play PRIMEGAME

Created by: ChrisR

Tags primes, sequence, conway

4

Solutions

156

Size

4

Solutions

156

Size

Problem 46117. Test approximations of the prime counting function

Created by: ChrisR

Tags special functions

2

Solutions

66

Size

2

Solutions

66

Size

Problem 46582. Find jumping medalists

Created by: ChrisR

Tags primes, sorting, number theory

6

Solutions

223

Size

6

Solutions

223

Size

Problem 46087. Investigate the frequency of last non-zero digits of primorials

Created by: ChrisR

Tags primes, number theory, primorial

5

Solutions

259

Size

5

Solutions

259

Size

Problem 46016. Determine digits of the Copeland-Erdos constant

Created by: ChrisR

Tags numbers, number theory

1

Solution

74

Size

1

Solution

74

Size

Problem 46047. Identify Wagstaff primes

Created by: ChrisR

Tags primes

1

Solution

106

Size

1

Solution

106

Size

Problem 46060. Identify primorial primes

Created by: ChrisR

Tags primes, number theory, primorial

1

Solution

123

Size

1

Solution

123

Size

Problem 46057. Find the last non-zero digit in a primorial

Created by: ChrisR

Tags primes, number theory, primorial

1

Solution

128

Size

1

Solution

128

Size

Problem 46099. Identify full reptend primes

Created by: ChrisR

Tags primes, number theory

1

Solution

132

Size

1

Solution

132

Size

Problem 46054. Count trailing zeros in a primorial

Created by: ChrisR

Tags primes, number theory, primorial

1

Solution

14

Size

1

Solution

14

Size

Problem 46046. Determine whether a number is a cluster prime

Created by: ChrisR

Tags primes, number theory

2

Solutions

93

Size

2

Solutions

93

Size

Problem 45994. Investigate the frequency of last digits of prime numbers

Created by: ChrisR

Tags primes, number theory

2

Solutions

273

Size

2

Solutions

273

Size

Problem 46701. Compute the nth Naerogahtyp emirp

Created by: ChrisR

Tags primes, pythagoras

2

Solutions

196

Size

2

Solutions

196

Size

Problem 46624. List the emirps

Created by: ChrisR

Tags sequences, primes

1

Solution

46

Size

1

Solution

46

Size

Problem 49738. Determine whether a prime is Pythagorean

Created by: ChrisR

Tags primes, pythagoras, number theory

1

Solution

90

Size

1

Solution

90

Size

Problem 45964. Compute the nth Pythagorean prime

Created by: ChrisR

Tags primes, pythagoras, number theory

1

Solution

120

Size

1

Solution

120

Size

Problem 60947. Euclid primes

Created by: Nicolas Douillet

Tags math, primes, numbers

4

Solutions

124

Size

4

Solutions

124

Size

Problem 60949. Check the integers additive decomposition conjecture

Created by: Nicolas Douillet

Tags math, primes, integers

2

Solutions

183

Size

2

Solutions

183

Size

Problem 60948. Check p² = 24k + 1, p > 3, the 'golden prime squares' equation

Created by: Nicolas Douillet

Tags math, primes, integers

1

Solution

60

Size

1

Solution

60

Size

Problem 60946. Fermat primes

Created by: Nicolas Douillet

Tags math, primes, numbers

2

Solutions

79

Size

2

Solutions

79

Size

Problem 60944. Ulam primes first formula

Created by: Nicolas Douillet

Tags math, prime, primes

5

Solutions

118

Size

5

Solutions

118

Size

Problem 60943. Ulam primes second formula

Created by: Nicolas Douillet

Tags math, primes, numbers

1

Solution

118

Size

1

Solution

118

Size

Problem 60942. Euler primes

Created by: Nicolas Douillet

Tags math, primes, numbers

1

Solution

114

Size

1

Solution

114

Size

Problem 60939. Frequencies of prime gaps

Created by: Nicolas Douillet

Tags math, prime, distance

1

Solution

43

Size

1

Solution

43

Size

Problem 60940. Find the first occurence of a given gap between two consecutive prime numbers

Created by: Nicolas Douillet

Tags math, primes, distance

1

Solution

86

Size

1

Solution

86

Size

Problem 60941. Prime numbers which are the difference of two consecutive cubes

Created by: Nicolas Douillet

Tags math, prime, primes

1

Solution

84

Size

1

Solution

84

Size

Problem 56343. Partial Pressure of Water Vapor from Relative Humidity

Created by: Meg Noah

Tags weather

4

Solutions

125

Size

4

Solutions

125

Size

Problem 56338. Pressure for a given Above Sea Level Altitude

Created by: Meg Noah

Tags weather

9

Solutions

130

Size

9

Solutions

130

Size

Problem 56353. Convert Volume Mixing Ratio to Density

Created by: Meg Noah

Tags weather

1

Solution

171

Size

1

Solution

171

Size

Problem 56373. Snow Accumulation and Structural Risks To Residential Properties

Created by: Meg Noah

Tags weather

1

Solution

64

Size

1

Solution

64

Size

Problem 56358. Calculate Wind Chill Factor

Created by: Meg Noah

Tags weather

1

Solution

37

Size

1

Solution

37

Size

Problem 45391. Calculate the sphericity of a Raschig ring

Created by: Karl Ezra Pilario

Tags easy, geometry, round

5

Solutions

82

Size

5

Solutions

82

Size

Problem 56328. Molar Air Density from Temperature and Pressure

Created by: Meg Noah

Tags weather

4

Solutions

59

Size

4

Solutions

59

Size

Problem 56333. Air Density from Temperature and Pressure

Created by: Meg Noah

Tags weather

1

Solution

66

Size

1

Solution

66

Size

Problem 56323. Air Mass to Star for an Observer at Mean Sea Level

Created by: Meg Noah

Tags weather

1

Solution

14

Size

1

Solution

14

Size

Problem 56313. Find Air Temperature from Cricket Stridulation Rate

Created by: Meg Noah

Tags weather, p1, aaaa<h>

1

Solution

12

Size

1

Solution

12

Size

Problem 56318. Predict Cricket Stridulation Rate from Air Temperature

Created by: Meg Noah

Tags weather

2

Solutions

80

Size

2

Solutions

80

Size

1 – 50 of 2,101