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1, 2, 3, 2, 5, 2, 7, 2, 3, 2, 11, 2, 13, 2, 3, 2, 17, 2, 19, 10, 3, 2, 23, 6, 5, 2, 3, 14, 29, 2, 31, 2, 3, 2, 5, 2, 37, 2, 3, 10, 41, 6, 43, 22, 3, 2, 47, 6, 7, 2, 3, 26, 53, 6, 5, 14, 3, 2, 59, 2, 61, 2, 21, 2, 5, 2, 67, 34, 3, 2, 71, 6, 73, 2, 3, 38, 7, 2, 79, 10, 3, 2, 83, 2, 5, 2, 3, 22, 89, 2, 7, 46, 3, 2, 5, 6
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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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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nonn
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AUTHOR
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STATUS
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approved
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