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A290787 a(n) is the position of the first occurrence of n^3 in the concatenation of the positive integers in decimal representation. 2
1, 8, 44, 83, 265, 378, 58, 267, 783, 2890, 289, 5802, 6781, 9866, 12390, 15274, 4288, 9223, 22764, 30890, 6595, 42130, 49725, 58010, 1575, 76770, 87305, 7670, 110835, 123890, 53786, 127309, 168575, 11048, 10389, 1884, 164216, 116326, 86857, 188924, 73351, 15241, 30690, 81318, 45139, 157378, 511828, 41849, 594784, 638890 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Zhining Yang, Table of n, a(n) for n = 1..100

EXAMPLE

3^3 = 27, so a(3) = 44 because the digit string "27" first occurs beginning at the 44th digit of the string

  s = "12345678910111213141516171819202122232425262728...":

.

.                  1         2         3         4

Position: 12345678901234567890123456789012345678901234567...

                                                     vv

       s: 12345678910111213141516171819202122232425262728...

                                                     ^^

MATHEMATICA

T = StringJoin @@ ToString /@ Range@ 700000; Table[StringPosition[T, ToString[ n^3], 1][[1, 1]], {n, 50}] (* Giovanni Resta, Aug 11 2017 *)

PROG

(VBA)

Sub test()

Dim i&, t$, s$(1 To 125000)

For i = 1 To 125000

s(i) = i

Next

t = Join(s, "")

For i = 1 To 50

Debug.Print InStr(t, i ^ 3); ", ";

Next

End Sub

CROSSREFS

Cf. A031297, A290647.

Sequence in context: A046329 A046377 A075816 * A188148 A316466 A100583

Adjacent sequences:  A290784 A290785 A290786 * A290788 A290789 A290790

KEYWORD

nonn,base

AUTHOR

Zhining Yang, Aug 10 2017

STATUS

approved

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Last modified November 13 04:20 EST 2019. Contains 329085 sequences. (Running on oeis4.)