A045719 Number of primes embedded in n-th prime.

0, 0, 0, 0, 0, 2, 2, 0, 2, 1, 2, 3, 0, 1, 1, 2, 1, 0, 1, 2, 3, 2, 1, 0, 2, 1, 3, 4, 1, 6, 5, 6, 10, 5, 5, 2, 6, 6, 7, 10, 9, 2, 3, 5, 9, 3, 2, 3, 2, 2, 3, 5, 3, 3, 3, 3, 2, 5, 3, 2, 5, 5, 4, 6, 4, 10, 4, 6, 7, 3, 3, 6, 6, 6, 9, 2, 5, 9, 1, 0, 5, 3, 5, 2, 3, 2, 0, 4, 3, 3, 4, 5, 2, 5, 0, 3, 2, 3, 5, 2, 4, 2, 4, 3, 6, 3

Offset: 1

Author

Felice Russo

Keywords

• nonn
• base

Comments

a(n) counts permuted subsequences of digits of prime(n) which denote primes distinct from prime(n).

Examples

			For example a(11)=3 because 37 generate 3 primes with its digits: 3, 7, 73
		

Crossrefs

Cf. A000040.

Extensions

More terms from David W. Wilson