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0, 0, 0, 1, 0, 2, 0, 7, -2, 8, 0, -1, 0, 36, 12, 29, 0, 2, 0, 5, 54, 76, 0, -13, -14, 216, 8, 7, 0, 2, 0, 103, 114, 304, 90, 41, 0, 540, 324, 35, 0, -18, 0, 11, -32, 676, 0, -15, -36, -8, 456, 13, 0, -34, 190, 49, 810, 1000, 0, -43, 0, 1620, -14, 341, 540, 134, 0, 17, 1014, 92, 0, 5, 0, 1848, -12, 19, 266, 314, 0, 145
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,6
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LINKS
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FORMULA
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PROG
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(PARI)
A005940(n) = { my(p=2, t=1); n--; until(!n\=2, if((n%2), (t*=p), p=nextprime(p+1))); (t); };
A156552(n) = { my(f = factor(n), p, p2 = 1, res = 0); for(i = 1, #f~, p = 1 << (primepi(f[i, 1]) - 1); res += (p * p2 * (2^(f[i, 2]) - 1)); p2 <<= f[i, 2]); res };
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CROSSREFS
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KEYWORD
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sign,less
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AUTHOR
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STATUS
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approved
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