A134665 - OEIS

A134665

Exponent of highest power of 2 dividing the n-th multiply perfect number A007691.

0, 1, 2, 3, 4, 5, 6, 5, 3, 9, 2, 9, 12, 7, 9, 8, 8, 13, 16, 7, 7, 10, 14, 13, 18, 14, 13, 11, 5, 10, 10, 8, 11, 11, 7, 7, 14, 15, 5, 9, 30, 11, 8, 17, 15, 11, 11, 14, 20, 20, 20, 15, 21, 19, 25, 19, 15, 17, 17, 17, 22, 25, 20, 25, 19, 19, 19, 27, 19, 19, 27, 17, 19, 27, 19, 21, 23, 20

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OFFSET

1,3

COMMENTS

The large terms, for example at n=41, correspond to the perfect numbers A000396 in A007691. See A134666 for the number of multiply perfect numbers having a given highest exponent of 2.

LINKS

T. D. Noe, Table of n, a(n) for n=1..5000 (using Flammenkamp's data)

Achim Flammenkamp, The Multiply Perfect Numbers Page

FORMULA

a(n) = A007814(A007691(n)). - Michel Marcus, Oct 10 2017

CROSSREFS

Cf. A007814, A007691.

Sequence in context: A245349 A122416 A307784 * A271832 A063260 A271859

Adjacent sequences: A134662 A134663 A134664 * A134666 A134667 A134668

KEYWORD

nonn

AUTHOR

T. D. Noe, Nov 05 2007

STATUS

approved