OFFSET
2,3
LINKS
Rémy Sigrist, Table of n, a(n) for n = 2..2500 (first 199 terms from Lucas H. Gabrielli)
Rémy Sigrist, Colored logarithmic scatterplot of the first 2500 terms
Rémy Sigrist, PARI program for A309572
EXAMPLE
For base 10, there are 9 primes whose substrings are also primes: 2, 3, 5, 7, 23, 37, 53, 73, and 373, thus a(10) = 9.
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Lucas H. Gabrielli, Aug 08 2019
STATUS
approved