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

Author

Omar E. Pol, Oct 22 2011

Keywords

• nonn
• base

Comments

The digits 0 and 5 do not appear among the first 30000 terms. When do they first appear? - Jianing Song, Apr 01 2021

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

Cf. A001113, A195844, A277270, A290643, A290644.

Cf. A096567, A195139, A195141, A280811, A341438.

Programs

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