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A370136
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Triangle read by rows: T(n,k) = arithmetic derivative of ((A002110(n) + A002110(k)) / A002110(k)), 1 <= k <= n.
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3
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1, 4, 1, 32, 5, 1, 55, 60, 12, 1, 1292, 195, 71, 16, 1, 22532, 2505, 841, 384, 9, 1, 382892, 102723, 8897, 8640, 191, 21, 1, 2469635, 3502740, 323328, 34133, 9980, 756, 24, 1, 111738812, 18755325, 10308201, 1568312, 50621, 5211, 371, 44, 1, 4853127108, 2003156919, 107924801, 178347008, 2376149, 251367, 6339, 672, 31, 1
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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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EXAMPLE
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Triangle begins as:
1;
4, 1;
32, 5, 1;
55, 60, 12, 1;
1292, 195, 71, 16, 1;
22532, 2505, 841, 384, 9, 1;
382892, 102723, 8897, 8640, 191, 21, 1;
2469635, 3502740, 323328, 34133, 9980, 756, 24, 1;
111738812, 18755325, 10308201, 1568312, 50621, 5211, 371, 44, 1;
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PROG
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(PARI)
A002110(n) = prod(i=1, n, prime(i));
A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1]));
A370135(n) = { n--; my(c = (sqrtint(8*n + 1) - 1) \ 2, x=A002110(1+n - binomial(c + 1, 2))); ((A002110(1+c)+x)/x); };
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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