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A095233
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a(n) = a(n-1) + Sum(floor(n/p): p prime), a(1) = 1.
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1
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1, 2, 4, 7, 11, 17, 24, 32, 41, 52, 64, 78, 93, 110, 129, 149, 170, 193, 217, 243, 271, 301, 332, 365, 399, 435, 472, 511, 551, 594, 638, 683, 730, 779, 830, 883, 937, 993, 1051, 1111, 1172, 1236, 1301, 1368, 1437, 1508, 1580, 1654, 1729, 1806, 1885
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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A013939[n_] := Sum[Floor[n/Prime[k]], {k, 1, n}]; RecurrenceTable[{a[n] == a[n - 1] + A013939[n], a[1] == 1}, a, {n, 1, 50}] (* G. C. Greubel, May 20 2017 *)
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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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