A110780 Copies of 1 and 9 alternately such that every partial concatenation is a prime.

11, 99999, 111111111, 9999999999, 11111111111111111111111111111111111111, 99999999999999999999999999999999999999999999999

Offset: 1

Author

Amarnath Murthy, Aug 12 2005

Keywords

• base
• nonn

Examples

			11, 1199999, 1199999111111111, ... are all prime.
		

Crossrefs

Cf. A110774, A110775, A110776, A110777, A110778, A110781.

Extensions

More terms from Joshua Zucker, Jan 11 2006

The next term has more than 800 1's and is too large to include.