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A353667
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a(n) = n / gcd(n, A351546(n)).
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4
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1, 2, 3, 4, 5, 3, 7, 8, 9, 5, 11, 3, 13, 7, 5, 16, 17, 18, 19, 10, 21, 11, 23, 6, 25, 13, 27, 1, 29, 15, 31, 32, 11, 17, 35, 36, 37, 19, 39, 4, 41, 21, 43, 11, 15, 23, 47, 12, 49, 50, 17, 26, 53, 27, 55, 7, 57, 29, 59, 15, 61, 31, 63, 64, 65, 33, 67, 34, 23, 35, 71, 72, 73, 37, 75, 19, 77, 39, 79, 40, 81, 41, 83, 3
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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)
A003961(n) = { my(f = factor(n)); for(i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); };
A351546(n) = { my(f=factor(sigma(n)), u=A003961(n)); prod(k=1, #f~, f[k, 1]^((0!=(u%f[k, 1]))*f[k, 2])); };
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CROSSREFS
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Differs from A098988 for the first time at n = 28, 30, 40, 60, 66, 84, 90, 102, 120, ...
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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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