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Search: id:A088109
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| A088109 |
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a(1)=1, a(n)= least odd triangular number which is a proper multiple of a(n-1) with a multiplier different from the ones used earlier. |
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+0
1
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| 1, 3, 15, 105, 2415, 26565, 1567335, 2785154295, 6918860803558935, 24055444284403886996443725, 332872543972802173225078010738842685950725, 571002075998998180604720399522520480910497598676930064638396594614026468525
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(2)/a(1) = 3, a(3)/a(2) = 5, a(4)/a(3) = 7, a(5)/a(4) = 23.
a(4) = 105 and not 45, = 3*15.
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CROSSREFS
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Cf. A088108.
Adjacent sequences: A088106 A088107 A088108 this_sequence A088110 A088111 A088112
Sequence in context: A070826 A048599 A129731 this_sequence A128276 A107878 A120016
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 24 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jul 20 2005
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