A351570 - OEIS

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A351570

Arithmetic derivative of the sum of the divisors of the largest unitary divisor of n that is a square.

0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 22, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 22, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 22, 1, 38

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OFFSET

1,36

COMMENTS

Observation: There seems to be no terms in range 2..19 in this sequence.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

Index entries for sequences related to sigma(n)

FORMULA

a(n) = A003415(A351568(n)) = A342925(A350388(n)) = A003415(A000203(A350388(n))).

PROG

(PARI)