A308527 Numbers that, for some x, are the concatenation of x+2, x+1 and x and are divisible by at least two of x+2, x+1 and x.
321, 432, 121110, 171615, 343332, 118117116, 232231230, 334333332, 333433333332, 452245214520, 333343333333332, 333334333333333332, 333333433333333333332, 333333343333333333333332
Offset: 1
Examples
232231230 is the concatenation of 232, 231 and 230, and is divisible by 231 and 230, so it is in the sequence.
Links
- Chai Wah Wu, Table of n, a(n) for n = 1..56
Programs
-
Maple
f:= proc(x) local t1, t2, q, a, b; t1:= 10^length(x); t2:= t1*10^length(x+1); q:= x*(1+t1+t2)+2*t2+t1; a:= (q/x)::integer; b:= (q/(x+1))::integer; if a and b then return q elif not(a) and not(b) then return NULL fi; if (q/(x+2))::integer then q else NULL fi end proc: map(f, [$1..10^8]);
Comments