A317944 a(n) = Product_{d|n, d>1} prime(A286378(d)-1).

1, 2, 3, 4, 5, 18, 7, 8, 33, 50, 13, 108, 17, 98, 285, 16, 23, 2178, 29, 500, 651, 338, 37, 648, 185, 578, 1353, 1372, 43, 162450, 47, 32, 2067, 1058, 2065, 143748, 61, 1682, 3417, 5000, 71, 847602, 73, 8788, 247665, 2738, 83, 3888, 581, 68450, 6141, 19652, 97, 3661218, 6565, 19208, 8961, 3698, 107, 92596500, 109, 4418, 809193, 64

Offset

1,2

Links

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

Index entries for sequences related to Stern's sequences

Formula

a(n) = Product_{d|n, d>1} A008578(A286378(d)).

For all k >= 0, a(2^k) = 2^k.

Prog

(PARI)
\\ Needs also code from A286378:
A317944(n) = { my(m=1); fordiv(n, d, if(d>1, m *= prime(A286378(d)-1))); (m); };

Crossrefs

Cf. A286378, A317942, A317945 (restricted growth sequence transform).

Cf. also A305794.

Sequence in context: A162657 A333046 A305794 * A145520 A337559 A061412

Adjacent sequences: A317941 A317942 A317943 * A317945 A317946 A317947

Keyword

nonn

Author

Antti Karttunen, Aug 12 2018

Status

approved