OFFSET
3,1
COMMENTS
a(10^k) = 10^k, for k>=1.
MSD of y can be 0.
In the first 1000 terms only 30060 is present two times, in a(354) and a(480).
LINKS
Paolo P. Lava, Table of n, a(n) for n = 3..1000
EXAMPLE
a(11) = 126 = concat(12,6) and 11*(12 + 6) - 12*6 = 126;
a(222) = 3921381 = concat(39,21381) and 222*(39 + 21381) - 39*21381 = 3921381.
MAPLE
with(numtheory): P:=proc(q) local j, k, s, t, n, ok;
for j from 3 to q do ok:=1; for n from 1 to q do if ok=0 then break; else
for k from 1 to ilog10(n) do s:=n mod 10^k; t:=trunc(n/10^k);
if j*(s+t)-s*t=n then print(n); ok:=0; break; fi; od; fi; od; od; end: P(10^6);
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Paolo P. Lava, Dec 05 2016
EXTENSIONS
a(258) by Giovanni Resta, Dec 05 2016
STATUS
approved