A092994 Smallest prime of the form concatenation of prime(n) with itself followed by a 7, or 0 if no such prime exists.

227, 37, 557, 0, 11117, 137, 17171717171717171717171717171717171717171717171717177, 197, 23232323232323237, 29297, 317, 0, 41414141414141414141414141414141414141414141417

Offset: 1

Author

Amarnath Murthy, Mar 28 2004

Keywords

• base
• nonn

Comments

a(12)=0 since the concatenation of 37 with itself, followed by a 7, is always composite. a(14), the term relative to 43, is a prime with 1089 digits. - Giovanni Resta, Apr 07 2006

Crossrefs

Cf. A092992, A092993, A092995.

Extensions

More terms from Giovanni Resta, Apr 07 2006