A238989 Numbers that are not odiousfree*evilfree. The complement of A237417.
1, 2, 4, 7, 8, 11, 13, 14, 16, 19, 22, 25, 26, 28, 31, 32, 37, 38, 41, 44, 47, 49, 50, 52, 56, 59, 61, 62, 64, 67, 69, 73, 74, 75, 76, 77, 79, 81, 82, 87, 88, 91, 94, 97, 98, 100, 103, 104, 107, 109, 112, 115, 118, 121, 122, 124, 125, 127, 128
Offset: 1
Links
- Amiram Eldar, Table of n, a(n) for n = 1..10000
Crossrefs
Programs
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Mathematica
odFreeQ[n_] := AllTrue[Rest @ Divisors[n], EvenQ[DigitCount[#, 2, 1]] &]; evFreeQ[n_] := AllTrue[Divisors[n], OddQ[DigitCount[#, 2, 1]] &]; m = 100; o = Select[Range[2, m], odFreeQ]; e = Select[Range[m], evFreeQ]; Complement[Range[m], Union @ Select[Times @@@ Tuples[{o, e}], # <= m &]] (* Amiram Eldar, Oct 16 2020 *)