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A134387 For the n in A102783, the least k such that n divides sigma_k(n). 2
0, 1, 2, 5, 6, 1, 4, 9, 3, 9, 14, 2, 2, 5, 18, 10, 10, 2, 7, 26, 9, 29, 1, 30, 2, 33, 9, 2, 7, 21, 2, 4, 41, 3, 2, 18, 15, 9, 24, 5, 50, 8, 53, 9, 18, 9, 14, 6, 15, 50, 7, 2, 65, 5, 26, 9, 3, 34, 69, 3, 9, 7, 21, 74, 5, 3, 26, 13, 81, 9, 86, 14, 2, 29, 89, 90, 4, 5, 18, 9, 48, 98, 11, 10, 17, 45 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

It appears that k < n/4. Record values of k occur when n=2p, where p is a prime with primitive root 2 (A001122). In this case, k=(p-1)/2.

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

CROSSREFS

Sequence in context: A131800 A086038 A200136 * A222132 A318388 A145058

Adjacent sequences:  A134384 A134385 A134386 * A134388 A134389 A134390

KEYWORD

nonn

AUTHOR

T. D. Noe, Oct 25 2007

STATUS

approved

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Last modified January 23 22:36 EST 2020. Contains 331177 sequences. (Running on oeis4.)