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A077368
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Triangular numbers whose external digits as well as internal digits form triangular numbers.
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4
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0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 231, 435, 465, 666, 1035, 2211, 3916, 4005, 6216, 6786, 19900, 41905, 46665, 48205, 162165, 171405, 200661, 222111, 329266, 400065, 1057785, 1646205, 2003001, 2318781, 2943951, 10628355
(list; graph; refs; listen; history; internal format)
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