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A116063
Semiprimes (A001358) made of nontrivial runs of identical digits.
1
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.
EXAMPLE
44477 = 79*563
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 13 2006
STATUS
approved