

A278779


Numbers n such that A000041(n) 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
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OFFSET

1,1


COMMENTS

Numbers n such that A278478(n) = 2.
Also numbers n such that A000041(n) has twice as many even divisors as odd divisors.


LINKS

Colin Barker, Table of n, a(n) for n = 1..1000


FORMULA

A000041(a(n)) = A278196(n).


PROG

(PARI) isok(n) = valuation(numbpart(n), 2)==2;
select(n>isok(n), vector(1000, n, n))


CROSSREFS

Cf. A000041, A278196, A278780, A278781, A278782, A278783, A278784.
Positions of 2's in A278478.
Sequence in context: A303815 A069962 A178098 * A045163 A282110 A275192
Adjacent sequences: A278776 A278777 A278778 * A278780 A278781 A278782


KEYWORD

nonn


AUTHOR

Colin Barker, Nov 28 2016


STATUS

approved



