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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.)