|
%I #5 Jul 30 2015 23:01:50
%S 7,14,15,19,20,25,26,35,37,37,39,44,46,52,55,60,63,70,73,80,83,92,96,
%T 100,104,110,115,117,122,127,133,133,139,142,149,149,156,159,167,167,
%U 175,178,187,189,198,204,205,205,205,206,206,210,211,212,212,213,214
%N First differences give the same sequence written as a string of individual digits.
%C Cf. A100787, A107974, A107975, A107976, A107977 for "seeds" 1, 3, 5, 7 and 9.
%e 7.14.15.19.20.25.26.35.37.37... <- sequence
%e .7..1..4..1..5..1..9..2..0... <- first differences = the sequence's digits
%t a[1] = 7; a[n_] := a[n] = a[n - 1] + Flatten[ Table[ IntegerDigits[ a[i]], {i, n - 1}]][[n - 1]]; Table[ a[n], {n, 60}] (* _Robert G. Wilson v_, Jun 15 2005 *)
%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
|
