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A260508 Numbers n such that A000203(n) == n*A001221(n). 0
6, 28, 120, 496, 672, 8128, 30240, 33550336, 8589869056, 137438691328 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of A007691.

a(n) is in A000396 iff A001221(a(n)) == 2, i.e., if a(n) is in A007774.

a(11) > 2.5*10^12. - Giovanni Resta, Jul 28 2015

LINKS

Table of n, a(n) for n=1..10.

PROG

(PARI) is(n) = sigma(n)==n*omega(n)

CROSSREFS

Cf. A000396, A007691.

Sequence in context: A026031 A002694 A007691 * A065997 A006516 A171476

Adjacent sequences:  A260505 A260506 A260507 * A260509 A260510 A260511

KEYWORD

nonn,more

AUTHOR

Felix Fröhlich, Jul 27 2015

EXTENSIONS

a(9)-a(10) from Giovanni Resta, Jul 28 2015

STATUS

approved

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Last modified February 19 07:51 EST 2019. Contains 320309 sequences. (Running on oeis4.)