A191576 Numbers n such that number of divisors of n equals the number of 1's in Gray code for n.

1, 2, 9, 10, 22, 25, 26, 34, 38, 46, 49, 58, 81, 94, 118, 121, 122, 134, 142, 148, 158, 164, 170, 172, 194, 206, 212, 226, 262, 292, 332, 356, 382, 386, 398, 404, 426, 428, 436, 446, 454, 478, 482, 502, 514, 526, 542, 548, 556, 578, 598, 602, 604, 618, 625

Offset

1,2

Comments

Numbers n such that A000005(n) = A005811(n).

Links

Table of n, a(n) for n=1..55.

Prog

(PARI) lista(nn) = {for (n=1, nn, if (numdiv(n)==sum(k=1, n, (-1)^((k/2^valuation(k, 2)-1)/2)), print1(n, ", ")); ); } \\ Michel Marcus, Apr 22 2013

Crossrefs

Cf. A000005, A005811.

Sequence in context: A304441 A005695 A079747 * A081346 A301872 A290592

Adjacent sequences: A191573 A191574 A191575 * A191577 A191578 A191579

Keyword

nonn,base,less

Author

Juri-Stepan Gerasimov, Jun 06 2011

Extensions

Entries corrected by R. J. Mathar, Jun 07 2011

Status

approved