| 1, 4, 12, 18, 30, 40, 60, 72, 90, 120, 140, 168, 180, 210, 252, 280, 315, 336, 360, 420, 504, 560, 630, 672, 720, 792, 840, 924, 990, 1008, 1155, 1232, 1260, 1320, 1386, 1540, 1584, 1680, 1848, 1980, 2016, 2310, 2376, 2520, 2640, 2772, 2970, 3024, 3080
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(4)=18 because the size-18 triangular multiplication table is the smallest to contain a particular number 4 times (namely the number A062858[4]=36).
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CROSSREFS
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The least such number is A062858[N].
Cf. A027424, A062851, A062854, A062855, A062856, A062857, A062858, A000217.
Sequence in context: A075867 A071929 A008037 this_sequence A008237 A008120 A166162
Adjacent sequences: A062856 A062857 A062858 this_sequence A062860 A062861 A062862
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KEYWORD
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nonn
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AUTHOR
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Ron A. Lalonde (ronronronlalonde(AT)hotmail.com), Jun 25 2001
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EXTENSIONS
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More terms from Don Reble (djr(AT)nk.ca), Nov 08 2001
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