|
|
A077146
|
|
a(n) = floor((concatenation of next (n+1) numbers) / (concatenation of next n numbers)).
|
|
1
|
|
|
23, 19, 173, 14093, 145, 137, 131, 127, 124, 121, 119, 117, 116453592, 11416794012, 1141, 1132, 1124, 1116, 1110, 1104, 1099, 1094, 1090, 1086, 1083, 1079, 1076, 1073, 1071, 1068, 1066, 1064, 1062, 1060, 1058, 1057, 1055, 1053, 1052, 1051, 1049, 1048, 1047
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
The numerator numbers to be concatenated are taken from 2,3,4,... and the denominator numbers from 1,2,3,... - Lars Blomberg, Mar 18 2012
|
|
LINKS
|
|
|
FORMULA
|
|
|
EXAMPLE
|
a(1) = floor(23/1) = 23.
a(2) = floor(456/23) = 19.
a(3) = floor(78910/456) = 173.
|
|
PROG
|
(Python)
def b(n): return int("".join(map(str, range((n-1)*n//2+1, n*(n+1)//2+1))))
def a(n): return b(n+1)//b(n)
|
|
CROSSREFS
|
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|