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

1,6

Comments

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

Links

Table of n, a(n) for n=1..106.

Example

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

Crossrefs

Cf. A000040.

Sequence in context: A272011 A352362 A236374 * A114906 A259179 A214667

Adjacent sequences: A045716 A045717 A045718 * A045720 A045721 A045722

Keyword

nonn,base

Author

Felice Russo

Extensions

More terms from David W. Wilson

Status

approved