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Search: id:A081472
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| A081472 |
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a(n) = the smallest (n+k) such that the LCM of numbers from (n+1) to (n+k) is a multiple of n. |
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+0
6
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| 2, 4, 6, 8, 10, 9, 14, 16, 18, 15, 22, 16, 26, 21, 20, 32, 34, 27, 38, 25, 28, 33, 46, 32, 50, 39, 54, 35, 58, 35, 62, 64, 44, 51, 42, 45, 74, 57, 52, 48, 82, 49, 86, 55, 54, 69, 94, 64, 98, 75, 68, 65, 106, 81, 66, 64, 76, 87, 118, 65, 122, 93, 72, 128, 78, 77, 134, 85, 92, 77
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OFFSET
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1,1
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EXAMPLE
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a(4) = 8 because lcm(5) = 5, lcm(5, 6) = 30 and lcm(5, 6, 7) = 210 are not divisible by 4, but lcm(5, 6, 7, 8) = 840 is.
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CROSSREFS
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Cf. A081467, A081468, A081469, A081470, A081471, A061243.
a(n) = n + A034699(n)
Sequence in context: A055952 A061243 A079431 this_sequence A097660 A154809 A153170
Adjacent sequences: A081469 A081470 A081471 this_sequence A081473 A081474 A081475
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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), Mar 23 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Mar 24 2003
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