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Search: id:A114708
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| 1, 1, 1, 1, 2, 0, 1, 1, 2, 0, 2, 0, 2, 0, 1, 1, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 3, 1, 1, 2, 1, 2, 1, 1, 2, 2, 1, 1, 3, 1, 2, 2, 2, 1, 1, 1, 0, 1, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 0, 2, 1, 1, 1, 1, 2, 1, 2, 1, 1, 2, 2, 2, 3, 1, 2, 1, 1, 1, 2, 2, 1, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 1, 3, 1, 2, 3, 1
(list; graph; listen)
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OFFSET
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2,5
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COMMENT
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First occurrence of k=0..8: 7, 2, 6, 30, 330, 4620, 46410, 570570, ..., . - Robert G. Wilson v, Dec 28 2005
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EXAMPLE
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A114707(11) = 11. Since 2 and 3 are the 2 distinct primes that divide 12, and neither divides 11, a(12) is 2 (and A114707(12) is 2 + A114707(11) = 13).
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MATHEMATICA
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a[1] = 1; a[n_] := a[n] = a[n - 1] + Length@Complement[First /@ FactorInteger@n, First /@ FactorInteger@a[n - 1]]; b = Array[a, 100]; Drop[b, 1] - Drop[b, -1] (from Robert G. Wilson v (rgwv(at)rgwv.com), Dec 28 2005)
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PROGRAM
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(PARI) {a=1; for(n=2, 106, print1(d=#setminus(Set(factor(n)[, 1]), Set(factor(a)[, 1])), ", "); a=a+d)} (Brockhaus)
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CROSSREFS
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Cf. A114707.
Sequence in context: A051010 A130027 A116949 this_sequence A084927 A072670 A087624
Adjacent sequences: A114705 A114706 A114707 this_sequence A114709 A114710 A114711
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Dec 26 2005
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EXTENSIONS
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More terms from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) and Robert G. Wilson v (rgwv(at)rgwv.com), Dec 27 2005
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