Unlike the previous two "ugly()" problems, in this one it appears that the number "1" is not considered ugly.
2 b | ~ 2 b
How to subtract?
Find the nearest integer
Sum of odd numbers in a matrix
Sum! Sum! Sum!
Sieve of Eratosthenes - 02
generate the matrix
Abelian Sandpile - 02
Sub-sequence - 01
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