OFFSET
1,1
LINKS
K. D. Bajpai, Table of n, a(n) for n = 1..720
EXAMPLE
a(1) = 82609:
4 + 82609^7 = 26253762656881427836948640304009173;
4 + 82609^9 = 179162157925737357103123335151825463343651893;
4 + 82609^11 = 1222646797417942588836172615268162579679296234658008213;
all four are prime.
MATHEMATICA
Select[Prime[Range[1, 2000000]], PrimeQ[4 + #^7] && PrimeQ[4 + #^9] && PrimeQ[4 + #^11] &]
PROG
(PARI) forprime(p=1, 1e7, if(isprime(4+p^7) && isprime(4+p^9) && isprime(4+p^11), print1(p, ", ")))
CROSSREFS
KEYWORD
nonn
AUTHOR
K. D. Bajpai, Jan 19 2015
STATUS
approved