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A064741
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Length of A064743(n); Index of the largest prime factor of the n-th term of EKG-sequence.
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7
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0, 1, 1, 2, 2, 2, 2, 1, 3, 3, 3, 2, 4, 4, 4, 2, 1, 3, 5, 5, 5, 2, 3, 3, 4, 4, 6, 6, 6, 2, 1, 7, 7, 7, 4, 8, 8, 8, 3, 3, 5, 9, 9, 9, 2, 3, 6, 2, 4, 4, 4, 3, 5, 6, 4, 10, 10, 10, 5, 11, 11, 11, 2, 1, 7, 12, 12, 12, 3, 6, 8, 3, 13, 13, 13, 2, 4, 5, 5, 14, 14, 14, 3, 7, 8, 3, 9, 15, 15, 15, 2, 4, 6, 6, 7, 5, 4, 2, 16, 16, 16, 8, 5, 4, 10
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OFFSET
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1,4
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LINKS
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FORMULA
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MATHEMATICA
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PrimePi@ FactorInteger[#][[-1, 1]] & /@ Nest[Append[#, Block[{k = 3}, While[Or[MemberQ[#, k], GCD[#[[-1]], k] == 1], k++]; k]] &, {1, 2}, 103] (* Michael De Vlieger, May 22 2018 *)
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PROG
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(PARI)
A061395(n) = if(n>1, primepi(vecmax(factor(n)[, 1])), 0);
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CROSSREFS
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Length of n-th row of table in A064744.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Offset corrected to 1, terms a(42) .. a(46) [that were terms a(41) .. a(45)] also corrected, more terms and alternative description added by Antti Karttunen, May 18 2018
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STATUS
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approved
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