A110790 Copies of 3 and 1 alternately such that every partial concatenation is a prime.

3, 1, 3, 111111111111111, 33333, 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111, 3333, 111111111111111111111111111, 33333

Offset: 1

Author

Amarnath Murthy, Aug 13 2005

Keywords

• base
• easy
• nonn

Comments

The next term has 168 digits. - Charles R Greathouse IV, Sep 29 2008

Examples

			3, 31, 313, 313111111111111111, ... are all prime.
		

Crossrefs

Cf. A110791 (digit lengths)

Other digits: A110774, A110776, A110778, A110780, A110782, A110788.

Extensions

a(6)-a(9) from_Charles R Greathouse IV_, Sep 29 2008