A055942 Smallest k > 1 such that k | Sigma(k) + n.

6, 2, 3, 2, 5, 2, 6, 2, 3, 2, 11, 2, 6, 2, 3, 2, 17, 2, 6, 2, 3, 2, 10, 2, 5, 2, 3, 2, 28, 2, 6, 2, 3, 2, 5, 2, 6, 2, 3, 2, 41, 2, 6, 2, 3, 2, 14, 2, 6, 2, 3, 2, 10, 2, 5, 2, 3, 2, 20, 2, 6, 2, 3, 2, 5, 2, 6, 2, 3, 2, 40, 2, 6, 2, 3, 2, 7, 2, 6, 2, 3, 2, 10, 2, 5, 2, 3, 2, 14, 2, 6, 2, 3, 2, 5, 2, 6, 2, 3

Offset

0,1

Links

Antti Karttunen, Table of n, a(n) for n = 0..65537

Mathematica

Do[ k = 2; While[ Mod[ DivisorSigma[ 1, k ] + n, k ] != 0, k++ ]; Print[ k ], {n, 0, 100} ]

Prog

(PARI) A055942(n) = for(k=2, oo, if(!((sigma(k)+n)%k), return(k))); \\ Antti Karttunen, Sep 30 2018

Crossrefs

Cf. A000203.

Sequence in context: A196525 A300892 A291359 * A127916 A165063 A307234

Adjacent sequences: A055939 A055940 A055941 * A055943 A055944 A055945

Keyword

easy,nonn

Author

Robert G. Wilson v, Jul 18 2000

Status

approved