A116063 Semiprimes (A001358) made of nontrivial runs of identical digits.

22, 33, 55, 77, 111, 1111, 1133, 1177, 1199, 3377, 4411, 4499, 5533, 5599, 6611, 6677, 7711, 7799, 8899, 9977, 11111, 11199, 11333, 11555, 22233, 22255, 22299, 22333, 22999, 33322, 44222, 44333, 44411, 44477, 44999, 55111, 55222, 55577

Offset: 1

Author

Giovanni Resta, Feb 13 2006

Keywords

• nonn
• base

Comments

A run of length 1 is trivial.

Examples

			44477 = 79*563
		

Crossrefs

Cf. A001358, A033023, A116062.