OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
a(3) = 13 is a term because 13 and 13*(1+3)+1 = 53 are prime.
MAPLE
select(t -> isprime(t) and isprime(t*convert(convert(t, base, 10), `+`)+1), [$2..10^4]);
PROG
(PARI) isok(p) = isprime(p) && isprime(p*sumdigits(p)+1); \\ Michel Marcus, Dec 18 2020
CROSSREFS
KEYWORD
nonn,base
AUTHOR
J. M. Bergot and Robert Israel, Dec 18 2020
STATUS
approved