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Search: id:A079168
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| A079168 |
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Weighted quadratic roundness of n. If n=p_1^e_1...p^k_e^k, then a(n)=e_1+2^2.e_2+...+k^2.e_k. Note that p_i<p_j, i<j, is assumed. |
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+0
3
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| 1, 1, 2, 1, 5, 1, 3, 2, 5, 1, 6, 1, 5, 5, 4, 1, 9, 1, 6, 5, 5, 1, 7, 2, 5, 3, 6, 1, 14, 1, 5, 5, 5, 5, 10, 1, 5, 5, 7, 1, 14, 1, 6, 6, 5, 1, 8, 2, 9, 5, 6, 1, 13, 5, 7, 5, 5, 1, 15, 1, 5, 6, 6, 5, 14, 1, 6, 5, 14, 1, 11, 1, 5, 9, 6, 5, 14, 1, 8, 4, 5, 1, 15, 5, 5, 5, 7, 1, 18, 5, 6, 5, 5, 5, 9, 1, 9, 6, 10
(list; graph; listen)
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OFFSET
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2,3
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EXAMPLE
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a(10)=5 as 10=2.5, therefore a(10)=1.1+4.1=5
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PROGRAM
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(PARI) weightedroundness2(n)=local(f, fl, s); f=factor(n); fl=length(f[, 1]); s=0; for (i=1, fl, s=s+i^2*f[, 2][i]); s alias(wr2, weightedroundness2) for (j=2, 500, print1(wr2(j)", "))
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CROSSREFS
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Cf. A079167, A079169, A001222.
Sequence in context: A132601 A047818 A055972 this_sequence A055205 A161686 A069626
Adjacent sequences: A079165 A079166 A079167 this_sequence A079169 A079170 A079171
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KEYWORD
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nonn
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AUTHOR
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Jon Perry (perry(AT)globalnet.co.uk), Dec 31 2002
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