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 A187613 Primes of the form 2*(n+1)^n-1 0
 3, 17, 127, 1249, 15551, 2305843009213693951, 31038897942201777945149702143, 2367537365232383918755194875240328986623, 570547835447447752112342166810585564655534923425416186081 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS For n=1,2,3,4,5 we have 5 prime numbers, so they are the first terms of the sequence. No other primes has been found for n<101. LINKS Table of n, a(n) for n=1..9. EXAMPLE For n=5 we have the prime p:=12^5-1=15551. MATHEMATICA Do[p=2*(n+1)^n-1; If[PrimeQ[p], Print[p]], {n, 100}] Select[Table[2(n+1)^n-1, {n, 40}], PrimeQ] (* Harvey P. Dale, Dec 02 2017 *) CROSSREFS Cf. A093460. Sequence in context: A129115 A246963 A093460 * A179300 A199493 A245059 Adjacent sequences: A187610 A187611 A187612 * A187614 A187615 A187616 KEYWORD nonn AUTHOR Marco Ripà, Mar 11 2011 STATUS approved

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Last modified April 17 07:13 EDT 2024. Contains 371756 sequences. (Running on oeis4.)