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 A296097 Triangular numbers that can be represented as a product of two triangular numbers greater than 1, as a product of three triangular numbers greater than 1, and as a product of four triangular numbers greater than 1. 1
 25200, 61425, 145530, 500500, 749700, 828828, 1185030, 2031120, 2162160, 2821500, 4573800, 5364450, 13857480, 17907120, 20991960, 21783300, 24643710, 27162135, 29610360, 30933045, 34283340, 37191000, 40901490, 60769800, 64292130, 71216145, 76576500, 90041490 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Triangular numbers in the products need not be distinct, that is, duplicates in the products are allowed. A subsequence of A188630 and of A295769. LINKS Table of n, a(n) for n=1..28. EXAMPLE 25200 = 210 * 120 = 120 * 21 * 10 = 28 * 15 * 10 * 6. CROSSREFS Cf. A000217, A188630, A295769. Sequence in context: A252614 A253530 A190319 * A076583 A226501 A046709 Adjacent sequences: A296094 A296095 A296096 * A296098 A296099 A296100 KEYWORD nonn AUTHOR Alex Ratushnyak, Dec 04 2017 STATUS approved

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Last modified June 1 02:53 EDT 2023. Contains 363068 sequences. (Running on oeis4.)