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A337134 a(n) = Sum_{k=1..n} floor(sqrt(2k-1)). 0

%I

%S 1,2,4,6,9,12,15,18,22,26,30,34,39,44,49,54,59,64,70,76,82,88,94,100,

%T 107,114,121,128,135,142,149,156,164,172,180,188,196,204,212,220,229,

%U 238,247,256,265,274,283,292,301,310,320,330,340,350,360,370,380,390,400,410,421,432

%N a(n) = Sum_{k=1..n} floor(sqrt(2k-1)).

%C Partial sums of A103128.

%t Table[Sum[Floor[Sqrt[2 i - 1]], {i, n}], {n, 100}]

%o (PARI) a(n) = sum(k=1, n, sqrtint(2*k-1)); \\ _Michel Marcus_, Aug 18 2020

%Y Cf. A103128.

%K nonn,easy

%O 1,2

%A _Wesley Ivan Hurt_, Aug 18 2020

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Last modified October 23 11:52 EDT 2021. Contains 348212 sequences. (Running on oeis4.)