OFFSET
1,2
COMMENTS
Numbers k such that digits 11 followed by k-1 occurrences of digit 6 followed by digit 3 is prime. E.g., 116666...666663.
a(35) > 3*10^5. - Robert Price, Oct 16 2015
LINKS
Makoto Kamada, Search for 116w3.
EXAMPLE
7 is in this sequence because (35*10^7 - 11)/3 = 116666663 is prime.
MATHEMATICA
Select[Range[0, 100000], PrimeQ[(35*10^# - 11)/3] &]
PROG
(Magma) [n: n in [0..400] |IsPrime((35*10^n-11) div 3)]; // Vincenzo Librandi, Feb 05 2016
(PARI) lista(nn) = {for(n=1, nn, if(ispseudoprime((35*10^n-11)/3), print1(n, ", "))); } \\ Altug Alkan, Feb 05 2016
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Robert Price, Feb 04 2016
STATUS
approved