1,6

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

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

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

Cf. A000040.

Sequence in context: A074943 A272011 A236374 * A114906 A259179 A214667

Adjacent sequences: A045716 A045717 A045718 * A045720 A045721 A045722

nonn,base

Felice Russo

More terms from David W. Wilson

approved