OFFSET
1,1
COMMENTS
A002283 is a subset of this sequence.
Contains 5*10^(2*m)+5*10^m+2 and 2*10^(2*m+1)+5*10^(m+1)+62 for m >= 2. - Robert Israel, Jun 29 2018
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..90
EXAMPLE
13088 * 13089 = 171308832;
13271 * 13272 = 176132712.
MAPLE
P:=proc(q) local k, n; for n from 1 to q do if n mod 10>0 then
for k from 1 to ilog10(n*(n+1))-ilog10(n)+1 do
if n=trunc(n*(n+1)/10^(k-1)) mod 10^(ilog10(n)+1) then print(n);
break; fi; od; fi; od; end: P(10^8);
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Paolo P. Lava, Jun 28 2018
EXTENSIONS
Edited by Robert Israel, Jun 29 2018
STATUS
approved