A110792 Copies of 7,3 and 1 cyclically such that every partial concatenation is a prime.

7, 3, 1111111, 777777777, 33, 11111111111111111111111111111111111111111111111111111111111111111, 7777777777777777777, 33333333333333333333, 111111111111111111111111111111111111111

Offset: 1

Author

Amarnath Murthy, Aug 13 2005

Keywords

• base
• nonn

Examples

			7,73,731111111,...are all prime.
		

Crossrefs

Cf. A110793 (digit lengths).

Other combinations: A110774, A110776, A110778, A110780, A110782, A110788, A110790.

Extensions

More terms from Sean A. Irvine, Mar 21 2010

a(9) from Jon E. Schoenfield, Jul 11 2010