|
%I #13 Apr 11 2016 21:24:12
%S 9,17,15,13,11,9,7,5,3,1,17,32,29,25,21,17,13,9,5,2,15,28,26,23,19,15,
%T 11,7,4,2,13,24,22,20,17,13,9,6,4,2,11,20,18,16,14,11,8,6,4,2,9,16,14,
%U 12,10,9,8,6,4,2,7,12,10,8,7,7,7,6,4,2,5,8,6,5,5,5,5,5,4,2,3,4,3,3,3,3,3,3,3,2,1,1,1,1,1,1,1,1,1,1,17,32
%N Quantity of ancestors for n (in the sense explained below)
%C See A271639 for the definition of an ancestor.
%e "0" has 9 ancestors, which are 11, 22, 33, 44, 55, 66, 77, 88 and 99; "1" has 17 ancestors, which are 10, 12, 21, 23, 32, 34, 43, 45, 54, 56, 65, 67, 76, 78, 87, 89, 98; "2" has 15 ancestors, which are 13, 20, 24, 31, 35, 42, 46, 53, 57, 64, 68, 75, 79, 86, 97; "3" has 13 ancestors, etc. Thus the sequence starts with 9, 17, 15, 13, etc.
%Y Cf. A271639.
%K nonn,base
%O 0,1
%A _Eric Angelini_ and _Jean-Marc Falcoz_, Apr 11 2016
|
