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 A081510 Numbers n such that 1+2^n+4^n+6^n is prime. 1
 1, 11, 23, 59, 399 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..5. EXAMPLE m=1: 1+2+4+6=13 prime. MATHEMATICA Do[s=1^w+2^w+4^w+6^w; If[IntegerQ[w/100], Print[{w}]]; If[PrimeQ[s], Print[{w, s}]], {w, 0, 1000}] Select[Range[400], PrimeQ[2^#+4^#+6^#+1]&] (* Harvey P. Dale, Jun 03 2023 *) PROG (PARI) is(n)=ispseudoprime(1+2^n+4^n+6^n) \\ Charles R Greathouse IV, Jun 13 2017 CROSSREFS Cf. A081509. Sequence in context: A105967 A097473 A366487 * A068844 A139905 A267437 Adjacent sequences: A081507 A081508 A081509 * A081511 A081512 A081513 KEYWORD more,nonn AUTHOR Labos Elemer, Apr 15 2003 STATUS approved

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Last modified May 28 00:20 EDT 2024. Contains 372900 sequences. (Running on oeis4.)