A047839 a(n) = n + floor( sqrt(2*n) ).
2, 4, 5, 6, 8, 9, 10, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 72, 73, 74, 75, 76, 77, 78, 79
Offset: 1
Links
- G. C. Greubel, Table of n, a(n) for n = 1..10000
Crossrefs
Cf. A047838.
Programs
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Magma
[n +Floor(Sqrt(2*n)): n in [1..100]]; // G. C. Greubel, Sep 08 2018
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Mathematica
Table[n +Floor[Sqrt[2*n]], {n,1,100}] (* G. C. Greubel, Sep 08 2018 *) -
PARI
{a(n) = if( n<0, 0, n + sqrtint(2*n))}
Comments