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A028988
Repdigit + 1 is prime (next term is 22...2 (36 digits)).
+0
15
1, 2, 4, 6, 22, 66, 88, 222, 666666, 22222222, 66666666, 666666666, 22222222222, 66666666666, 88888888888888, 88888888888888888, 66666666666666666666, 66666666666666666666666, 88888888888888888888888888888888888
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Maintained by
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.
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