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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
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
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.)