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A293216
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a(n) = Product_{d|n, d<n} A260443(d).
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8
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1, 2, 2, 6, 2, 36, 2, 30, 12, 108, 2, 2700, 2, 180, 216, 210, 2, 48600, 2, 40500, 360, 1620, 2, 661500, 36, 2700, 1080, 94500, 2, 153090000, 2, 2310, 3240, 3780, 1080, 4465125000, 2, 40500, 5400, 69457500, 2, 34445250000, 2, 21262500, 4082400, 56700, 2, 560290500, 60, 127575000, 7560, 49612500, 2, 1205583750000, 9720, 254677500, 81000, 132300, 2
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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(n) = Product_{d|n, d<n} A260443(d).
For all n >= 0, a(2^n) = A002110(n).
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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); \\ This function from Michel Marcus
A293216(n) = { my(m=1); fordiv(n, d, if(d < n, m *= A260443(d))); m; };
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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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