OFFSET
1,3
COMMENTS
Numbers of the form 4*h+3 are not in the sequence, since in this case 57^n+2 is divisible by 5.
Numbers ending with 6 are not in the sequence, since in this case 57^n+2 is divisible by 11.
If n == 10 mod 16, 57^n+2 is divisible by 17. - Derek Orr, Oct 04 2014
a(14) > 2*10^5. - Robert Price, Jun 11 2015
LINKS
Henri & Renaud Lifchitz, PRP Top Records: Search for 57^n+2.
MATHEMATICA
Select[Range[0, 2000], PrimeQ[57^# + 2] &]
PROG
(Magma) [n: n in [0..300]| IsPrime( 57^n + 2 )];
(PARI) for(n=1, 10^3, if(ispseudoprime(57^n+2), print1(n, ", "))) \\ Derek Orr, Oct 04 2014
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, Oct 03 2014
EXTENSIONS
Edited by Bruno Berselli, Oct 04 2014
a(13) from Robert Price, Jun 11 2015
STATUS
approved