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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
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
Sequence in context: A118646 A097969 A082280 * A146609 A121129 A051402
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Don Reble, Nov 10 2005
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)