A233385 Primes that are a concatenations of n-th Mersenne exponent and n-th Mersenne prime.

23, 37, 7127, 138191, 19524287

Offset: 1

Author

Juri-Stepan Gerasimov, Dec 08 2013

Keywords

• nonn
• base
• less

Comments

Primes of the form A000043(n)*10^A028335(n) + A000668(n).

Examples

			a(4) is 138191(prime number) where 13 is 5th Mersenne exponent and 8191 is 5th Mersenne prime.
		

Crossrefs

Cf. A000043, A000668, A028335.