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A033705 Fancy primitive repdigit polygonal numbers (with multiplicity). 3
6, 9, 22, 55, 66, 88, 111, 111, 222, 333, 444, 555, 666, 777, 888, 6666, 44444, 111111, 111111, 777777, 999999, 111111111, 777777777, 9999999999, 333333333333, 555555555555, 555555555555, 1111111111111, 1111111111111 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
M. Keith, On Repdigit Polygonal Numbers, J. Integer Sequences, Vol. 1, 1998, #6.
CROSSREFS
Sequence in context: A043883 A112393 A006132 * A033704 A121592 A295726
KEYWORD
nonn
AUTHOR
Mike Keith (domnei(AT)aol.com)
STATUS
approved

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Last modified April 13 09:16 EDT 2024. Contains 371640 sequences. (Running on oeis4.)