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Search: id:A028988
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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 (list; graph; listen)
OFFSET

0,2
LINKS

P. De Geest, Repdigits: WONplate 83

CROSSREFS

Cf. A010785.

Sequence in context: A108439 A152482 A045960 this_sequence A086172 A141526 A106274

Adjacent sequences: A028985 A028986 A028987 this_sequence A028989 A028990 A028991

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com)

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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