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 A199192 Primes of the form 3^(2n-3)+3^(n-1)+1. 2
 7, 37, 271, 2269, 19927, 129159847, 1162320517, 49269609804781974450852068861184694669, 589881151426658740854227725580736348850640632297373414091790995505756623268837 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The corresponding n are in A199191. The next term -- a(10) -- has 152 digits. - Harvey P. Dale, May 28 2015 LINKS FORMULA Primes in A198410. MATHEMATICA a={}; Do[p=( (3^(n-1) + 1)^3 -1)/3^n; If[PrimeQ[p], AppendTo[a, p]], {n, 10^2}]; Print[a]; Select[Table[3^(2n-3)+3^(n-1)+1, {n, 100}], PrimeQ] (* Harvey P. Dale, May 28 2015 *) CROSSREFS Cf. A198410, A199191. Sequence in context: A217723 A100309 A198410 * A089677 A075996 A173766 Adjacent sequences:  A199189 A199190 A199191 * A199193 A199194 A199195 KEYWORD nonn AUTHOR Michel Lagneau, Nov 03 2011 STATUS approved

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Last modified February 25 05:15 EST 2020. Contains 332217 sequences. (Running on oeis4.)