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A087359
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For n > 2, a(n) is the smallest triangular number > a(n-1) and congruent to a(n-1) (mod a(n-2)).
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1
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1, 3, 6, 15, 21, 36, 78, 1770, 2628, 330078, 1160526, 1106921826, 27467109390, 3405462502501956, 464491597897585896, 35168538277628662422146736, 113107978211040574688911417114776, 158163225773885113469535108323447683287341095656
(list; graph; refs; listen; history; internal format)
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