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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A081508 Primes of form 1 + 3^k + 5^k. 2 3, 244672067, 14551915378461487103639747, 3552713678880267372432493847753987, 211758236813575107295480170109084902352995775163267 (list; graph; refs; listen; history; text; internal format) OFFSET 1,1 LINKS Amiram Eldar, Table of n, a(n) for n = 1..6 FORMULA a(n) = A074507(A076515(n)). - Amiram Eldar, Aug 11 2024 MATHEMATICA Do[s=1^w+3^w+5^w; If[IntegerQ[w/100], Print[{w}]]; If[PrimeQ[s], Print[{w, s}]], {w, 0, 1000}] PROG (PARI) lista(kmax) = {my(p); for(k = 0, kmax, p = 1 + 3^k + 5^k; if(isprime(p), print1(p, ", "))); } \\ Amiram Eldar, Aug 11 2024 CROSSREFS Cf. A074507, A076515, A277122. Sequence in context: A229092 A058469 A367670 * A368722 A067481 A058433 Adjacent sequences: A081505 A081506 A081507 * A081509 A081510 A081511 KEYWORD nonn,changed AUTHOR Labos Elemer, Apr 15 2003 STATUS approved

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Last modified August 18 17:05 EDT 2024. Contains 375269 sequences. (Running on oeis4.)