

A265486


Numbers n such that 64^n  8^n  1 is prime.


1



3, 6, 15, 19, 36, 75, 80, 118, 199, 336, 360, 520, 1282, 1810, 2872, 4870, 14467, 15102, 22499, 24675, 45615, 105648, 116432
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OFFSET

1,1


COMMENTS

For n = 3, 6, 15, 19 the corresponding primes are 261631, 68719214591, 1237940039285345090527035391, 20769187434139310370006797241024511.
3*a(n) belongs to A098845 (the terms from a(18) to a(23) are derived from that sequence).


LINKS

Table of n, a(n) for n=1..23.


EXAMPLE

3 is in the sequence because 64^3  8^3  1 = 261631 is prime.


MATHEMATICA

Select[Range[1000], PrimeQ[64^#  8^#  1] &]


PROG

(MAGMA) [n: n in [0..300]  IsPrime(64^n8^n1)];
(PARI) for(n=1, 1e3, if(ispseudoprime(64^n  8^n  1), print1(n, ", "))) \\ Altug Alkan, Dec 12 2015


CROSSREFS

Cf. A098845, similar sequences listed in A265481.
Sequence in context: A174279 A233554 A276546 * A060304 A342555 A075868
Adjacent sequences: A265483 A265484 A265485 * A265487 A265488 A265489


KEYWORD

nonn,more


AUTHOR

Vincenzo Librandi, Dec 12 2015


STATUS

approved



