A328387 - OEIS

A328387

Numbers k such that A276086(k) is a multiple of k.

1, 3, 15, 25, 75, 105, 147, 175, 343, 385, 525, 539, 625, 735, 825, 1029, 1155, 1225, 1331, 1375, 1617, 1815, 2695, 3003, 3025, 3675, 3773, 3993, 4375, 5005, 5145, 5577, 5775, 6655, 6825, 8085, 8125, 8281, 8575, 9075, 9555, 9625, 10725, 11011, 11319, 12675, 12705, 13013, 13377, 15015, 15379, 15925, 17303, 17745, 17787, 17875

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OFFSET

1,2

COMMENTS

All terms are odd. Of the first 3003 terms, 1709 are multiples of five.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..3003

PROG

(PARI)

A276086(n) = { my(m=1, p=2); while(n, m *= (p^(n%p)); n = n\p; p = nextprime(1+p)); (m); };

isA328387(n) = (0==(A276086(n)%n));

CROSSREFS