A369976 Numbers k for which A369974(k) is odd.

1, 9, 12, 15, 16, 20, 21, 25, 28, 33, 35, 39, 44, 49, 51, 52, 55, 57, 65, 68, 69, 76, 77, 85, 87, 91, 92, 93, 95, 108, 111, 115, 116, 119, 121, 123, 124, 129, 133, 135, 141, 143, 145, 148, 155, 159, 161, 164, 169, 172, 177, 180, 183, 185, 187, 188, 189, 192, 201, 203, 205, 209, 212, 213, 215, 217, 219, 221, 235

Offset: 1

Author

Antti Karttunen, Feb 09 2024

Keywords

• nonn

Comments

Because A369002 is a multiplicative semigroup this is its subsequence. Proof is similar to one given in A359780.

Links

• Antti Karttunen, Table of n, a(n) for n = 1..21017

Crossrefs

Cf. A083345, A369001, A369975 (characteristic function).

Positions of odd terms in A369974 and in A369978.

Subsequence of A369002.

Cf. also A359780.

Programs

PARI

\\ See A369975.