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

1,1

Comments

A run of length 1 is trivial.

Links

Table of n, a(n) for n=1..38.

Example

44477 = 79*563

Crossrefs

Cf. A001358, A033023, A116062.

Sequence in context: A120146 A138840 A257473 * A131317 A176597 A067087

Adjacent sequences: A116060 A116061 A116062 * A116064 A116065 A116066

Keyword

nonn,base

Author

Giovanni Resta, Feb 13 2006

Status

approved