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A324537
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a(n) = A003557(k), where k = Product_{d|n, d>2} prime(A297167(d)).
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3
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1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 1, 4, 1, 5, 3, 1, 1, 6, 1, 3, 5, 7, 1, 12, 1, 11, 1, 5, 1, 54, 1, 1, 7, 13, 5, 36, 1, 17, 11, 9, 1, 250, 1, 7, 9, 19, 1, 60, 1, 15, 13, 11, 1, 30, 7, 5, 17, 23, 1, 1620, 1, 29, 5, 1, 11, 686, 1, 13, 19, 375, 1, 540, 1, 31, 15, 17, 7, 2662, 1, 45, 1, 37, 1, 3500, 13, 41, 23, 7, 1, 2430, 11, 19, 29, 43, 17, 420, 1, 35, 7, 75, 1
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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)
A061395(n) = if(1==n, 0, primepi(vecmax(factor(n)[, 1])));
A003557(n) = { my(f=factor(n)); for (i=1, #f~, f[i, 2] = f[i, 2]-1); factorback(f); }; \\ From A003557
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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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