A293231 - OEIS

A293231

a(n) = Product_{d|n, d<n} A019565(A193231(d)).

1, 2, 2, 12, 2, 36, 2, 120, 6, 60, 2, 5400, 2, 360, 30, 25200, 2, 56700, 2, 21000, 180, 840, 2, 23814000, 10, 504, 630, 50400, 2, 661500, 2, 554400, 420, 132, 300, 392931000, 2, 792, 252, 242550000, 2, 24948000, 2, 2772000, 22050, 1980, 2, 605113740000, 60, 4851000, 66, 3880800, 2, 720373500, 700, 4889808000, 396, 2772, 2, 588305025000, 2, 1848

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OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..1024

Index entries for sequences related to binary expansion of n

FORMULA

a(n) = Product_{d|n, d<n} A019565(A193231(d)).

For all n >= 1, A007814(a(n)) = A290090(n).

For n = 0..5, a(A001317((2^n)-1)) = A002110((2^n)-1).

PROG

(PARI)