A373835 - OEIS

A373835

a(n) = gcd(bigomega(n), A276085(n)), where bigomega (A001222), and A276085 are fully additive with a(p) = 1 and a(p) = p#/p respectively.

0, 1, 1, 2, 1, 1, 1, 3, 2, 1, 1, 1, 1, 1, 2, 4, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 3, 1, 1, 3, 1, 5, 2, 1, 2, 2, 1, 1, 2, 1, 1, 3, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 1, 6, 2, 3, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 3, 1, 5, 4, 1, 1, 2, 2, 1, 2, 1, 1, 1, 2, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 3, 1, 1, 1

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OFFSET

1,4

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..100000

PROG

(PARI)

A276085(n) = { my(f = factor(n)); sum(k=1, #f~, f[k, 2]*prod(i=1, primepi(f[k, 1]-1), prime(i))); };

A373835(n) = gcd(bigomega(n), A276085(n));

CROSSREFS

Cf. A001222, A276085, A373833 [= a(A276086(n))], A373836, A373837 (positions of multiples of 3).

Sequence in context: A071178 A366895 A326515 * A373369 A319864 A072776

Adjacent sequences: A373832 A373833 A373834 * A373836 A373837 A373838

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jun 19 2024

STATUS

approved