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 A007708 Prime(n)*...*a(n) is the least product of consecutive primes which is abundant. 10
 5, 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 A007686 only for n=1. - Michel Marcus, Mar 10 2013 LINKS Amiram Eldar, Table of n, a(n) for n = 1..1000 MATHEMATICA a[n_] := Module[{p = Prime[n]}, r = 1 + 1/p; While[r <= 2,  p = NextPrime[p]; r *= 1 + 1/p]; p]; Array[a, 39] (* Amiram Eldar, Jun 29 2019 *) 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. A005101, A007686, A007707, A007741. Sequence in context: A118646 A097969 A082280 * A146609 A121129 A051402 Adjacent sequences:  A007705 A007706 A007707 * A007709 A007710 A007711 KEYWORD nonn AUTHOR EXTENSIONS More terms from Don Reble, Nov 10 2005 STATUS approved

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Last modified May 20 16:05 EDT 2022. Contains 353874 sequences. (Running on oeis4.)