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 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
 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 (list; graph; refs; listen; history; text; internal format)
 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: A016529 A077894 A053214 * A046110 A296091 A352892 Adjacent sequences: A077195 A077196 A077197 * A077199 A077200 A077201 KEYWORD nonn AUTHOR Joseph L. Pe, Nov 30 2002 STATUS approved

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Last modified March 3 16:49 EST 2024. Contains 370512 sequences. (Running on oeis4.)