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A087899 Primes associated with A087898. 2
5, 29, 389, 8969, 331889, 17590169, 1178541389, 93104769809, 14617448860169, 2528818652809409, 483004362686597309, 95151859449259670069, 26357065067444928609389, 7406335283952024939238589, 3414320565901883496988989989, 1635459551067002195057726205209 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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
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

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)