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1, 2, 3, 8, 5, 18, 7, 12, 27, 50, 11, 32, 13, 98, 75, 20, 17, 30, 19, 72, 147, 242, 23, 108, 125, 338, 45, 200, 29, 162, 31, 28, 363, 578, 245, 48, 37, 722, 507, 300, 41, 450, 43, 392, 243, 1058, 47, 500, 343, 70, 867, 968, 53, 42, 605, 588, 1083, 1682, 59, 128, 61, 1922, 675, 44, 845, 882, 67, 1352, 1587, 1250, 71, 180, 73, 2738, 105
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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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a(p) = p for all primes p.
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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 }; \\ From A005940
A156552(n) = {my(f = factor(n), 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}; \\ From A156552
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CROSSREFS
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Cf. A332451 for a complementary sequence (after its initial 1).
Permutation of A026424 after the initial 1.
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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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