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A371910
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Position of A109890(n) among the sorted set of divisors of A109735(n-1).
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3
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2, 4, 4, 4, 7, 6, 3, 4, 9, 5, 6, 12, 9, 9, 11, 14, 9, 13, 9, 4, 4, 3, 6, 7, 6, 10, 12, 5, 5, 6, 8, 9, 13, 12, 4, 15, 5, 3, 4, 6, 8, 4, 9, 17, 7, 2, 5, 3, 8, 7, 6, 13, 8, 17, 6, 7, 4, 9, 10, 8, 13, 17, 15, 7, 3, 7, 13, 5, 6, 16, 8, 11, 8, 5, 4, 13, 12, 17, 5, 6
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OFFSET
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3,1
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COMMENTS
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LINKS
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FORMULA
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EXAMPLE
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n b(n) s(n-1) a(n) c(n) i
--------------------------------------
3 3 = 3 2 2 1
4 6 = 6 4 4 2
5 4 12 4 6
6 8 16 4 5
7 12 24 7 8
8 9 36 6 9
9 5 45 3 6
10 10 50 4 6
11 15 60 9 12
12 25 75 5 6
...
222 113573 = 113573 4 4 3
...
232 230801 = 230801 4 4 4
...
279 941071 = 941071 4 4 5
...
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MATHEMATICA
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nn = 120; c[_] := False;
Array[Set[{a[#], c[#]}, {#, True}] &, 2]; s = a[1] + a[2];
Reap[Do[d = Divisors[s]; k = SelectFirst[d, ! c[#] &];
c[k] = True; Sow[FirstPosition[d, k][[1]]];
s += k, {n, 3, nn}] ][[-1, 1]]
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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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