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 A327979 a(n) = gcd(n, A002322(n)), where A002322 is Carmichael lambda, also known as psi. 4
 1, 1, 1, 2, 1, 2, 1, 2, 3, 2, 1, 2, 1, 2, 1, 4, 1, 6, 1, 4, 3, 2, 1, 2, 5, 2, 9, 2, 1, 2, 1, 8, 1, 2, 1, 6, 1, 2, 3, 4, 1, 6, 1, 2, 3, 2, 1, 4, 7, 10, 1, 4, 1, 18, 5, 2, 3, 2, 1, 4, 1, 2, 3, 16, 1, 2, 1, 4, 1, 2, 1, 6, 1, 2, 5, 2, 1, 6, 1, 4, 27, 2, 1, 6, 1, 2, 1, 2, 1, 6, 1, 2, 3, 2, 1, 8, 1, 14, 3, 20, 1, 2, 1, 4, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS Antti Karttunen, Table of n, a(n) for n = 1..65537 FORMULA a(n) = gcd(n, A002322(n)). MATHEMATICA Array[GCD[#, CarmichaelLambda[#]] &, 100] (* Amiram Eldar, Oct 04 2019 *) PROG (PARI) A327979(n) = gcd(n, lcm(znstar(n)[2])); CROSSREFS Cf. A002322. Cf. also A009191, A009194, A009195, A306695. Sequence in context: A248470 A082067 A082061 * A107286 A339791 A087039 Adjacent sequences:  A327976 A327977 A327978 * A327980 A327981 A327982 KEYWORD nonn AUTHOR Antti Karttunen, Oct 04 2019 STATUS approved

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Last modified April 13 16:27 EDT 2021. Contains 342936 sequences. (Running on oeis4.)