

A128005


Numbers n such that (40^n  1)/39 is prime.


11




OFFSET

1,1


COMMENTS



LINKS



MATHEMATICA

Select[Prime[Range[100]], PrimeQ[(40^#1)/39]&]


PROG

(PARI) isok(n) = isprime((40^n1)/39); \\ Michel Marcus, Mar 13 2016


CROSSREFS



KEYWORD

hard,more,nonn


AUTHOR



EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008


STATUS

approved



