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Search: id:A074145
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| A074145 |
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a(1) = 1; for n>1, a(n) is the smallest previously unused natural number such that a(n) divides the sum of next a(n) terms. |
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+0
1
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| 1, 2, 3, 5, 4, 6, 7, 8, 15, 9, 10, 11, 12, 19, 13, 23, 14, 16, 17, 18, 27, 20, 30, 31, 24, 21, 22, 36, 25, 26, 37, 28, 47, 39, 29, 33, 32, 51, 44, 34, 35, 56, 38, 40, 41, 42, 63, 48
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OFFSET
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1,2
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COMMENT
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4 comes after 5 hence the next terms after 5 are so chosen that the property holds for 4 as well.
The next term a(49) does not exist, so there are no more terms. This is because a(25)=24 and a(27)=22 both must divide a(49). Assuming that a(49)=x, this leads to 867+x=24a and 824+x=22b for some integers a and b. Subtracting, we get 43=24a-22b, which is a contradiction. - John W. Layman (layman(AT)math.vt.edu), Jul 29 2003
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EXAMPLE
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5 divides the sum (4 + 6 +7 +8 + 15) of the next five terms and 4 does so for (6+7+8+15).
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CROSSREFS
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Cf. A074137, A074138.
Sequence in context: A131142 A131141 A130981 this_sequence A105363 A123917 A154444
Adjacent sequences: A074142 A074143 A074144 this_sequence A074146 A074147 A074148
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KEYWORD
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fini,full,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 28 2002
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EXTENSIONS
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More terms from John W. Layman (layman(AT)math.vt.edu), Jul 29 2003
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