A332226 Numbers k such that sigma(k) is congruent to 2 modulo 8.

10, 17, 20, 26, 40, 41, 52, 58, 73, 74, 80, 89, 90, 97, 104, 106, 113, 116, 122, 137, 148, 153, 160, 180, 193, 202, 208, 212, 218, 232, 233, 234, 241, 244, 257, 281, 296, 298, 313, 314, 320, 325, 337, 346, 353, 360, 362, 369, 394, 401, 404, 409, 416, 424, 433, 436, 449, 457, 458, 464, 468, 488, 490, 521, 522, 538, 554

Offset

1,1

Links

Antti Karttunen, Table of n, a(n) for n = 1..25000

Index entries for sequences related to sigma(n)

Mathematica

Select[Range[600], Mod[DivisorSigma[1, #], 8]==2&] (* Harvey P. Dale, Mar 30 2025 *)

Prog

(PARI) isA332226(n) = (2==(sigma(n)%8));

Crossrefs

Cf. A000203.

Subsequence of A191217.

Subsequences: A332227 (odd terms), A332228.

Sequence in context: A350779 A280591 A308691 * A396267 A338590 A003333

Adjacent sequences: A332223 A332224 A332225 * A332227 A332228 A332229

Keyword

nonn

Author

Antti Karttunen, Feb 13 2020

Status

approved