A228698 a(n) = 8*Product{i=1..n} p(i) - 1, where p(i) = i-th odd prime.

7, 23, 119, 839, 9239, 120119, 2042039, 38798759, 892371479, 25878772919, 802241960519, 29682952539239, 1217001054108839, 52331045326680119, 2459559130353965639, 130356633908760178919, 7691041400616850556279, 469153525437627883933079, 31433286204321068223516359, 2231763320506795843869661559

Offset

0,1

Links

Alois P. Heinz, Table of n, a(n) for n = 0..150

A. J. Hanson, G. Ortiz, A. Sabry and Y.-T. Tai, Discrete Quantum Theories, arXiv preprint arXiv:1305.3292, 2013 [See footnote 25]

Maple

a:= n-> 8*mul(ithprime(i+1), i=1..n)-1:
seq(a(n), n=0..20);  # Alois P. Heinz, Sep 16 2013

Mathematica

8*FoldList[Times, 1, Prime[Range[2, 30]]]-1 (* Harvey P. Dale, Mar 19 2015 *)

Crossrefs

Cf. A228699.

Sequence in context: A053706 A137367 A267926 * A064640 A064639 A064638

Adjacent sequences: A228695 A228696 A228697 * A228699 A228700 A228701

Keyword

nonn

Author

N. J. A. Sloane, Sep 03 2013

Status

approved