OFFSET
1,1
COMMENTS
Numbers n such that p=26n+1 is prime and the greatest prime divisor of p-1 is 13.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Do[If[Take[FactorInteger[EulerPhi[26n+1]][[ -1]], 1]=={13} && PrimeQ[26n+1], Print[n]], {n, 1, 10000}] (*Artur Jasinski*)
Select[Range[600], PrimeQ[26#+1]&&FactorInteger[26#][[-1, 1]]==13&] (* Harvey P. Dale, Jun 01 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Dec 13 2006
EXTENSIONS
Edited by Don Reble, Apr 24 2007
STATUS
approved