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A107977 First differences give the same sequence written as a string of individual digits. 6

%I

%S 9,18,19,27,28,37,39,46,48,56,59,66,69,78,82,88,92,100,105,111,116,

%T 125,131,137,143,152,159,167,175,177,185,193,202,204,205,205,205,206,

%U 206,211,212,213,214,215,216,222,223,225,230,231,234,235,236,239,246,247

%N First differences give the same sequence written as a string of individual digits.

%e 9.18.19.27.28.37.39.46.48.56 ... <- sequence

%e .9..1..8..1..9..2..7..2..8 ... <- first differences are the sequence's digits.

%t a[1] = 9; a[n_] := a[n] = a[n - 1] + Flatten[ Table[ IntegerDigits[ a[i]], {i, n - 1}]][[n - 1]]; Table[ a[n], {n, 56}] (* _Robert G. Wilson v_, Jun 15 2005 *)

%Y Cf. A100787, A107974, A107975, A107976, A107977 for "seeds" 1, 3, 5, 7 and 9.

%K base,easy,nonn

%O 1,1

%A _Eric Angelini_, Jun 12 2005

%E Edited and extended by _Robert G. Wilson v_, Jun 15 2005

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Last modified June 19 05:18 EDT 2021. Contains 345125 sequences. (Running on oeis4.)