As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Sums with Excluded Digits
It dseon't mettar waht oedrr the lrettes in a wrod are.
Who has power to do everything in this world?
construct matrix with identical rows
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Don't Try, give up and return NaN.
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