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Search: id:A095163
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| A095163 |
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a(n) = smallest divisor d of n that occurs earlier in the sequence fewer than d times. |
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+0
6
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| 1, 2, 3, 2, 5, 3, 7, 4, 3, 5, 11, 4, 13, 7, 5, 4, 17, 6, 19, 4, 7, 11, 23, 6, 5, 13, 9, 7, 29, 5, 31, 8, 11, 17, 7, 6, 37, 19, 13, 8, 41, 6, 43, 11, 9, 23, 47, 6, 7, 10, 17, 13, 53, 6, 11, 7, 19, 29, 59, 10, 61, 31, 9, 8, 13, 11, 67, 17, 23, 10, 71, 8, 73, 37, 15, 19, 11, 13, 79, 8, 9, 41, 83
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Agrees with A033677 for the first 19 and many further terms; A095787 gives those n for which A033677 and the present sequence disagree.
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EXAMPLE
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For n = 12 we have divisors 1, 2, 3, 4, 6, 12; 1 occurs earlier once, 2 occurs earlier twice, 3 occurs earlier 3 times, but 4 occurs earlier only once, hence a(12) = 4.
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PROGRAM
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(PARI) {m=83; v=vector(m); for(n=1, m, d=divisors(n); j=1; while(v[d[j]]>=d[j], j++); print1(d[j], ", "); v[d[j]]=v[d[j]]+1)}
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CROSSREFS
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Cf. A033677, A095787, A095161, A095162, A095164, A095165.
Sequence in context: A139421 A165500 A072505 this_sequence A033677 A116548 A117818
Adjacent sequences: A095160 A095161 A095162 this_sequence A095164 A095165 A095166
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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), Jun 01 2004
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EXTENSIONS
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Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) Jun 05 2004 and Jun 09 2004
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