OFFSET

1,1

LINKS

Caldwell and Honaker, Prime Curios!

FORMULA

EXAMPLE

a(1) = 3 because the first 10 primes are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, among which there are three primes ending in 3.

PROG

(PARI) a(n) = #select(x->((x % 10) == 3), primes(10^n)); \\ Michel Marcus, Mar 07 2018

CROSSREFS

KEYWORD

nonn,base,more

AUTHOR

G. L. Honaker, Jr., Mar 05 2018

EXTENSIONS

a(3)-a(8) from Chuck Gaydos

a(9) from Jon E. Schoenfield, Mar 20 2018

a(10)-a(12) from Giovanni Resta, Mar 27 2018

STATUS

approved