A077198 a(n) = lambda(sigma(n)), where lambda(n) is the Carmichael lambda function, which gives the smallest integer m such that k^m = 1 mod n for all integers k relatively prime to n.

1, 2, 2, 6, 2, 2, 2, 4, 12, 6, 2, 6, 6, 2, 2, 30, 6, 12, 4, 6, 8, 6, 2, 4, 30, 6, 4, 6, 4, 6, 8, 6, 4, 18, 4, 12, 18, 4, 6, 12, 6, 8, 10, 6, 12, 6, 4, 30, 18, 30, 6, 42, 18, 4, 6, 4, 4, 12, 4, 6, 30, 8, 12, 126, 6, 12, 16, 6, 8, 12, 6, 12, 36, 18, 30, 12, 8, 6, 4, 30, 110, 6, 6, 24, 18, 10, 4

Offset

1,2

Links

Antti Karttunen, Table of n, a(n) for n = 1..16384

Index entries for sequences related to sigma(n)

Formula

a(n) = A002322(A000203(n)). - Antti Karttunen, Nov 18 2017

Mathematica

Table[CarmichaelLambda[DivisorSigma[1, n]], {n, 1, 100}]

Prog

(PARI) A077198(n) = lcm(znstar(sigma(n))[2]); \\ Antti Karttunen, Nov 18 2017

Crossrefs

Cf. A000203, A002322.

Cf. also A062401, A290088.

Sequence in context: A077894 A374031 A053214 * A046110 A296091 A352892

Adjacent sequences: A077195 A077196 A077197 * A077199 A077200 A077201

Keyword

nonn

Author

Joseph L. Pe, Nov 30 2002

Status

approved