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1, 1, 5, 3, 21, 1, 7, 2, 31, 39, 123, 5, 45, 55, 185, 15, 705, 25, 275, 175, 215, 1425, 3975, 125, 325, 425, 6125, 4125, 22125, 1, 9, 1, 41, 51, 55, 1, 59, 71, 247, 159, 951, 95, 365, 115, 1445, 381, 5385, 325, 2175, 565, 1655, 2775, 30075, 1375, 12625, 8375, 46625, 63375, 166125, 7, 77, 91, 329, 35, 427, 119, 483
(list;
graph;
refs;
listen;
history;
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internal format)
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OFFSET
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1,3
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LINKS
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FORMULA
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PROG
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(PARI)
A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1]));
A327860(n) = { my(s=0, m=1, p=2, e); while(n, e = (n%p); m *= (p^e); s += (e/p); n = n\p; p = nextprime(1+p)); (s*m); };
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CROSSREFS
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KEYWORD
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nonn,frac,easy
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AUTHOR
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STATUS
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approved
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