A101218 Primes that are a concatenation of 2, 3 and a prime.

233, 2311, 2341, 2347, 2371, 2383, 2389, 23131, 23167, 23173, 23197, 23227, 23251, 23269, 23293, 23311, 23431, 23509, 23557, 23563, 23593, 23599, 23677, 23719, 23743, 23761, 23773, 23827, 23857, 23887, 23911, 23929, 23971, 23977, 231019

Offset: 1

Author

Parthasarathy Nambi, Dec 14 2004

Keywords

• nonn
• base
• easy

Examples

			233 is a prime concatenated from the primes 2,3 and 3
2311 is a prime concatenated from the primes 2,3 and 11
		

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000
• Peter Alfeld The 10,000 smallest prime numbers.

Crossrefs

Cf. A100607, A101219, A101249, A101250, A101251, A101252.

Programs

Mathematica

Select[23*10^IntegerLength[#]+#&/@Prime[Range[200]],PrimeQ] (* Harvey P. Dale, Jun 09 2013 *)

Extensions

Extended by Ray Chandler, Dec 22 2004