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A228698 a(n) = 8*Product{i=1..n} p(i) - 1, where p(i) = i-th odd prime. 2
7, 23, 119, 839, 9239, 120119, 2042039, 38798759, 892371479, 25878772919, 802241960519, 29682952539239, 1217001054108839, 52331045326680119, 2459559130353965639, 130356633908760178919, 7691041400616850556279, 469153525437627883933079, 31433286204321068223516359, 2231763320506795843869661559 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 19 03:34 EDT 2019. Contains 328211 sequences. (Running on oeis4.)