OFFSET
1,2
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
1 is in the sequence because 2351 is prime.
49 is in the sequence because 23549 is prime.
171 is in the sequence because 235171 is prime.
MAPLE
map(p->p[2], select(p -> isprime(235*10^p[1]+p[2]), [seq([1, k], k=1..9, 2), seq(seq([d, k], k=10^(d-1)+1..10^d, 2), d=2..3)])); # Robert Israel, Jan 11 2018
PROG
(Magma) [ n: n in [1..800] | IsPrime(Seqint(Intseq(n) cat [5, 3, 2])) ]; // Klaus Brockhaus, Feb 02 2011
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Parthasarathy Nambi, Mar 25 2005
STATUS
approved