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Search: id:A011906
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| A011906 |
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If b(n) is A011900 and c(n) is A001109, then a(n) = b(n)*c(n) = b(n) + (b(n)+1) + (b(n)+2) + ... + c(n). |
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1
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| 1, 18, 525, 17340, 586177, 19896030, 675781821, 22956120408, 779829016225, 26491211221770
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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Mario Velucchi "From the desk of ... Mario Velucchi" in 'Mathematics and Informatics quarterly' volume 7 - 2/1997, p. 81.
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EXAMPLE
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a(3) = 525 = 15*35 = 15 + 16 + ... + 35.
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CROSSREFS
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Adjacent sequences: A011903 A011904 A011905 this_sequence A011907 A011908 A011909
Sequence in context: A035023 A126276 A035277 this_sequence A133401 A061079 A003298
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KEYWORD
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nonn,easy
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AUTHOR
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Mario Velucchi (mathchess(AT)velucchi.it)
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