cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A179654 Sum of the numbers already removed (including the target number) in the first jump of a Sieve of Eratosthenes table.

Original entry on oeis.org

4, 10, 33, 53, 138, 201, 340, 431, 624, 1024, 1116, 1557, 1989, 2202, 2702, 3357, 4098, 4520, 5484, 6109, 6615, 7608, 8502, 9802, 11391, 12286, 13002, 14160, 14918, 16142, 19896, 21320, 23069, 23760, 27377, 28429, 30430, 33159, 34977, 37876, 40177
Offset: 0

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Author

Odimar Fabeny, Jul 22 2010

Keywords

Comments

2(4) = 4, 3(6) = 10(4,6), 5(10) = 33(6,8,9,10), 7(14) = 53(8,9,10,12,14), 11(22) = 138(12,14,15,16,18,20,21,22).

Crossrefs

Cf. A000040 and A179628.

Programs

  • Mathematica
    fQ[n_, p_] := Block[{q = First /@ FactorInteger@n}, Union[p >= # & /@ q] == {True}]; f[n_] := Block[{p = Prime@n}, Plus @@ Select[ Range[p + 1, 2 p], fQ[ #, p] &]]; Array[f, 41] (* Robert G. Wilson v, Aug 23 2010 *)

Extensions

a(6)-a(41) from Robert G. Wilson v, Aug 23 2010