1,1
M. Keith, On Repdigit Polygonal Numbers, J. Integer Sequences, Vol. 1, 1998, #6.
Cf. A033705-A033707.
Sequence in context: A202869 A202871 A144626 * A178043 A049925 A118114
Adjacent sequences: A033704 A033705 A033706 * A033708 A033709 A033710
nonn
Mike Keith (domnei(AT)aol.com)