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A007686 Prime(n)*...*a(n) is the least product of consecutive primes which is non-deficient. 3
3, 13, 31, 73, 149, 233, 367, 521, 733, 991, 1249, 1579, 1949, 2341, 2791, 3343, 3881, 4481, 5147, 5849, 6619, 7499, 8387, 9341, 10321, 11411, 12517, 13709, 15013, 16363, 17881, 19381, 20873, 22369, 24007, 25763, 27611, 29399, 31357 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Differs from A007708 only for n=1. - Michel Marcus, Mar 10 2013

LINKS

Table of n, a(n) for n=1..39.

H. W. Gould, A class of binomial sums and a series transform, Utilitas Math., 45 (1994), 71-83. (Annotated scanned copy)

PROG

(PARI) a(n) = {p = prime(n); sig = p+1; prd = p; while (sig < 2*prd, p = nextprime(p+1); sig *= p+1; prd *= p; ); return (p); } \\ Michel Marcus, Mar 10 2013

CROSSREFS

Cf. A005100, A007684, A007702, A007708.

Sequence in context: A106090 A067980 A164569 * A147030 A146259 A146174

Adjacent sequences:  A007683 A007684 A007685 * A007687 A007688 A007689

KEYWORD

nonn

AUTHOR

Walter Nissen

EXTENSIONS

More terms from Don Reble, Nov 10 2005

STATUS

approved

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Last modified May 19 10:36 EDT 2019. Contains 323390 sequences. (Running on oeis4.)