A319342 a(n) = Product_{d|n, d<n} prime(A318881(d)), where A318881(d) records the prime signature of A000010(d).

1, 2, 2, 4, 2, 12, 2, 12, 6, 20, 2, 108, 2, 28, 30, 60, 2, 252, 2, 300, 42, 28, 2, 2700, 10, 44, 42, 588, 2, 11700, 2, 780, 42, 68, 70, 26460, 2, 44, 66, 19500, 2, 19404, 2, 588, 2730, 28, 2, 456300, 14, 1100, 102, 1452, 2, 19404, 70, 32340, 66, 44, 2, 29659500, 2, 76, 3234, 13260, 110, 19404, 2, 3468, 42, 112700, 2, 18918900, 2, 116

Offset

1,2

Links

Antti Karttunen, Table of n, a(n) for n = 1..8192

Formula

a(n) = Product_{d|n, d<n} prime(A318881(d)).

Prog

(PARI) A319342(n) = { my(m=1); fordiv(n, d, if((d<n), m *= prime(A318881(d)))); (m); }; \\ Needs also code from A318881

Crossrefs

Cf. A318881, A319343 (rgs-transform), A319344.

Cf. also A305982.

Sequence in context: A305792 A317942 A296071 * A318834 A353564 A067228

Adjacent sequences: A319339 A319340 A319341 * A319343 A319344 A319345

Keyword

nonn

Author

Antti Karttunen, Sep 17 2018

Status

approved