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Search: id:A075528
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| A075528 |
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Triangular numbers that are half other triangular numbers. |
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+0
5
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| 0, 3, 105, 3570, 121278, 4119885, 139954815, 4754343828, 161507735340, 5486508657735, 186379786627653, 6331426236682470, 215082112260576330, 7306460390622912753, 248204571168918457275, 8431648959352604634600
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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Martin V Bonsangue, Gerald E Gannon & Laura J. Pheifer, Misinterpretations can sometimes be a good thing, Math. Teacher, vol. 95, No. 6 (2002) pp. 446-449.
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FORMULA
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G.f.: 3x/[(1-x)(1-34x+x^2)].
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CROSSREFS
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a(n) = 3*A029546(n-1) = A029549(n)/2.
Sequence in context: A101780 A050651 A103037 this_sequence A101485 A074072 A037115
Adjacent sequences: A075525 A075526 A075527 this_sequence A075529 A075530 A075531
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KEYWORD
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nonn
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Sep 19 2002
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