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).
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^n-8^n-1)];
(PARI) for(n=1, 1e3, if(ispseudoprime(64^n - 8^n - 1), print1(n, ", "))) \\ Altug Alkan, Dec 12 2015
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, Dec 12 2015
STATUS
approved