A101249 Primes that are a concatenation of 5, 7 and a prime.

577, 5711, 5717, 5737, 5741, 5743, 5779, 5783, 57107, 57131, 57139, 57149, 57163, 57173, 57179, 57191, 57193, 57223, 57241, 57251, 57269, 57271, 57283, 57331, 57347, 57349, 57367, 57373, 57383, 57389, 57397, 57457, 57467, 57487, 57503

Offset: 1

Author

Parthasarathy Nambi, Dec 16 2004

Keywords

• nonn
• base
• easy

Examples

			5711 is a prime concatenated from the primes 5,7 and 11.
		

Links

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

Crossrefs

Cf. A100607, A101218, A101219, A101250, A101251, A101252.

Programs

Mathematica

Select[ Table[ FromDigits[ Flatten[ IntegerDigits /@ {5, 7, Prime[n]}]], {n, 100}], PrimeQ[ # ] &] (* Robert G. Wilson v, Dec 20 2004 *)

Extensions

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