

A176087


Numbers n such that (10^n1)/3 * 10^ceiling(log_10(n+1)) + n is prime.


3




OFFSET

1,2


COMMENTS

No term is a multiple of 2, 3, or 5. The decimal expansion of each corresponding prime is n 3's with n's decimal expansion concatenated. Probable primes found by PrimeForm. Prime for 253 proved by Primo. No more terms up to 50000.


LINKS



EXAMPLE

The first term is 1 because 31 is prime.


PROG



CROSSREFS



KEYWORD

bref,more,nonn


AUTHOR



STATUS

approved



