A087899 Primes associated with A087898.

5, 29, 389, 8969, 331889, 17590169, 1178541389, 93104769809, 14617448860169, 2528818652809409, 483004362686597309, 95151859449259670069, 26357065067444928609389, 7406335283952024939238589, 3414320565901883496988989989, 1635459551067002195057726205209

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..214

Formula

a(n) = -1 + Product_{k=1..n-1} A087898(k).

a(n) == 9 (mod 10) for n>1. - Sam Alexander, Jan 06 2005

Mathematica

s = {}; ps = {2}; Do[r = Times @@ ps; p = ps[[-1]]; While[p = NextPrime[p]; ! PrimeQ[r*p - 1]]; AppendTo[ps, p]; AppendTo[s, r*p - 1], {15}]; s (* Amiram Eldar, Jan 19 2023 *)

Crossrefs

Cf. A087898.

Sequence in context: A356486 A289483 A216027 * A202759 A103783 A103515

Adjacent sequences: A087896 A087897 A087898 * A087900 A087901 A087902

Keyword

nonn

Author

Lekraj Beedassy, Oct 14 2003

Extensions

a(14) from Sam Alexander, Jan 06 2005

More terms from Amiram Eldar, Jan 19 2023

Status

approved