|
|
A235460
|
|
a(1)=2. For n>1, assume a(n-1) has decimal expansion abcdefghij (with at most ten digits, where some of j,i,h, ... may be missing). Then a(n) = sum 11...1 (with a 1's) + 22...2 (with b 2's) + 33...3 (with c 3's) + ...
|
|
1
|
|
|
2, 11, 3, 111, 6, 111111, 21, 13, 223, 366, 555666, 1733331, 2224228
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
See A235400 for the analogous sequence where we number the digits starting with 9 at the rightmost digit.
|
|
REFERENCES
|
Rodolfo Kurchan, Problems with repdigits, to appear in Proceedings of Gathering for Gardner 2014 conference
|
|
LINKS
|
|
|
EXAMPLE
|
2 means two 1's = 11; 11 means one 1 + one 2 = 3; 3 means 111; 111 means 1+2+3 = 6; 6 means 111111 = 1+2+3+4+5+6 = 21; 21 means 11+2 = 13; etc.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|