A195138 First digit to appear n times in the decimal expansion of e.
2, 2, 8, 8, 2, 2, 2, 2, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 2, 2, 2, 2, 2, 2, 2, 3, 9, 9, 2, 7, 4, 4, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9
Offset: 1
Examples
From _Michael De Vlieger_, Sep 10 2017: (Start) a(n) is the first decimal digit of e that first appears n times when e is expanded to the -m place: n a(n) m 1 2 0 2 2 4 3 8 7 4 8 9 5 2 22 6 2 30 7 2 33 8 2 40 9 9 58 10 7 63 11 7 64 12 7 68 13 7 78 14 7 83 15 7 89 16 7 99 (End)
Links
- Alois P. Heinz, Table of n, a(n) for n = 1..10000
Crossrefs
Programs
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Mathematica
With[{e = First@ RealDigits[N[E, 10^4]]}, Function[t, -1 + Map[FirstPosition[t, #] &, Range@ Max@ t][[All, -1]]]@ Table[BinCounts[Take[e, n], {0, 10, 1}], {n, 10^3}]] (* Michael De Vlieger, Sep 10 2017 *)
Extensions
More terms from D. S. McNeil, Oct 22 2011
Comments