OFFSET
1,1
COMMENTS
The 4 generated primes always end with 1, 3, 7, 9 in base 10 in this order.
EXAMPLE
a(1) = 7 is a term since 7 is prime and 101, 103, 107, 109 are also prime.
Some larger examples include:
171850185252132304529579363573540628229,
204480960976715817535460959250816270267,
338006806817314508391110932058603239271.
MATHEMATICA
Select[Prime@ Range[10^4], AllTrue[Flatten[#1 + {-#2, #2}], PrimeQ] & @@ {15 #, {2, 4}} &] (* Michael De Vlieger, Mar 19 2021 *)
PROG
(PARI) isok(p) = isprime(p) && isprime(15*p-4) && isprime(15*p-2) && isprime(15*p+2) && isprime(15*p+4);
CROSSREFS
KEYWORD
nonn
AUTHOR
Tamas Nagy, Mar 19 2021
STATUS
approved