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A072862 The smallest k>1 such that k divides sigma(k*n) is equal to 6. 6
1, 4, 9, 16, 25, 36, 64, 81, 100, 121, 144, 225, 256, 289, 324, 400, 484, 529, 576, 625, 729, 841, 900, 1024, 1089, 1156, 1296, 1600, 1681, 1936, 2025, 2116, 2209, 2304, 2401, 2500, 2601, 2809, 2916, 3025, 3364, 3481, 3600, 4096, 4356, 4624, 4761, 5041 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The smallest k>1 such that k divides sigma(k*n) is always 2, 3 or 6. Sequence generates squares but not all the squares (49 is the first missing square).

LINKS

Table of n, a(n) for n=1..48.

CROSSREFS

Solutions to Mod[A000203(x), 6]=1.

Sequence in context: A235597 A309002 A328558 * A300303 A062295 A238203

Adjacent sequences:  A072859 A072860 A072861 * A072863 A072864 A072865

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Jul 26 2002

STATUS

approved

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Last modified November 21 04:47 EST 2019. Contains 329350 sequences. (Running on oeis4.)