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A068899
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Triangular numbers containing 2n digits obtained by duplicating the first n digits; i.e. triangular numbers in A020338.
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0
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55, 66, 5050, 5151, 203203, 255255, 426426, 500500, 501501, 581581, 828828, 930930, 39653965, 50005000, 50015001, 61566156, 3347133471, 5000050000, 5000150001, 6983669836, 220028220028, 500000500000, 500001500001
(list; graph; refs; listen; history; internal format)
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