A101251 Primes that are a concatenation of 2, 3, 5 and a prime.

2357, 23531, 23537, 23561, 23567, 235181, 235199, 235211, 235241, 235307, 235337, 235349, 235397, 235439, 235523, 235541, 235577, 235601, 235607, 235661, 235673, 235751, 235787, 235811, 235877, 235919, 235967, 235997, 2351033, 2351171

Offset: 1

Author

Parthasarathy Nambi, Dec 16 2004

Keywords

• nonn
• easy
• base

Examples

			2357 is a prime of order four since it is concatenated from the primes 2,3,5 and 7.
		

Links

• Daniel Starodubtsev, Table of n, a(n) for n = 1..10000
• Peter Alfeld, The 10,000 smallest prime numbers.

Crossrefs

Cf. A101218, A101219, A101249, A101250, A101252.

Programs

Mathematica

Select[ Table[ FromDigits[ Flatten[ IntegerDigits /@ {2, 3, 5, Prime[n]}]], {n, 200}], PrimeQ[ # ] &] (* Robert G. Wilson v, Dec 20 2004 *)

Extensions

Extended by Ray Chandler and Robert G. Wilson v, Dec 22 2004