A138794 a(n) = A138793(n+1)-A138793(n).

20, 300, 4000, 50000, 600000, 7000000, 80000000, 900000000, 1000000000, 1100000000000, 210000000000000, 31000000000000000, 4100000000000000000, 510000000000000000000, 61000000000000000000000

Offset

1,1

Comments

First differences of A138793

Links

Table of n, a(n) for n=1..15.

Formula

a(n) = A138793(n+1)-A138793(n)

Mathematica

b = {}; a = {}; Do[w = RealDigits[n]; w = First[w]; Do[AppendTo[a, w[[k]]], {k, 1, Length[w]}]; p = FromDigits[Reverse[a]]; AppendTo[b, p], {n, 1, 31}]; c = {}; Do[AppendTo[c, b[[n + 1]] - b[[n]]], {n, 1, Length[b] - 1}]; c (*Artur Jasinski*)

Crossrefs

Cf. A000422, A116504, A007908, A116505, A104759, A138789, A138790, A138793, A075019, A075020, A075021, A075022.

Sequence in context: A291256 A250015 A344197 * A077758 A202270 A053541

Adjacent sequences: A138791 A138792 A138793 * A138795 A138796 A138797

Keyword

nonn,base

Author

Artur Jasinski, Mar 30 2008

Status

approved