A290080 - OEIS

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A290080

a(1) = 0; for n > 1, a(n) = sigma(bigomega(n)).

0, 1, 1, 3, 1, 3, 1, 4, 3, 3, 1, 4, 1, 3, 3, 7, 1, 4, 1, 4, 3, 3, 1, 7, 3, 3, 4, 4, 1, 4, 1, 6, 3, 3, 3, 7, 1, 3, 3, 7, 1, 4, 1, 4, 4, 3, 1, 6, 3, 4, 3, 4, 1, 7, 3, 7, 3, 3, 1, 7, 1, 3, 4, 12, 3, 4, 1, 4, 3, 4, 1, 6, 1, 3, 4, 4, 3, 4, 1, 6, 7, 3, 1, 7, 3, 3, 3, 7, 1, 7, 3, 4, 3, 3, 3, 12, 1, 4, 4, 7, 1, 4, 1, 7, 4

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OFFSET

1,4

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences computed from exponents in factorization of n

FORMULA

a(1) = 0; for n > 1, a(n) = A000203(A001222(n)).

a(n) = A193511(n) + A193512(n).

PROG

(Scheme) (define (A290080 n) (if (= 1 n) 0 (A000203 (A001222 n))))

CROSSREFS