login
A278779
Numbers m such that A000041(m) is of the form 2^2 * k for odd k.
7
26, 30, 55, 58, 59, 62, 74, 78, 80, 84, 100, 108, 112, 113, 117, 124, 126, 135, 153, 187, 191, 200, 205, 258, 265, 280, 291, 310, 317, 323, 336, 337, 342, 344, 351, 352, 353, 358, 359, 365, 374, 380, 384, 404, 409, 416, 444, 445, 458, 481, 485, 492, 501, 503
OFFSET
1,1
COMMENTS
Numbers m such that A278478(m) = 2.
Also numbers m such that A000041(m) has twice as many even divisors as odd divisors.
LINKS
FORMULA
A000041(a(n)) = A278196(n).
MATHEMATICA
Select[Range[3000], IntegerExponent[PartitionsP[#], 2] == 2 &] (* Amiram Eldar, May 25 2024 *)
PROG
(PARI) isok(n) = valuation(numbpart(n), 2)==2;
select(n->isok(n), vector(1000, n, n))
CROSSREFS
Positions of 2's in A278478.
Sequence in context: A303815 A069962 A178098 * A045163 A282110 A373621
KEYWORD
nonn
AUTHOR
Colin Barker, Nov 28 2016
STATUS
approved