1,2

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

a(n) = A000203(n) / A295313(n) = A109395(A000203(n)).

(PARI) a(n) = my(sn = sigma(n)); sn/gcd(sn, eulerphi(sn)); \\ Michel Marcus, Nov 23 2017

Cf. A000010, A000203, A009195, A109395, A295313, A295315.

Sequence in context: A182885 A182891 A071190 * A057020 A257322 A276466

Adjacent sequences: A295311 A295312 A295313 * A295315 A295316 A295317

nonn

Antti Karttunen, Nov 22 2017

approved