0,1

a(0)=4

a(1)=6 because 4*6 = 24

a(2)=26 because 24*26 = 624

a(3)=126 because 624*126 = 78624

a(4)=3126 because 78624*3126 = 245778624

a(5)=15625001 because 245778624*15625001 = 3840291245778624

P:=proc(n) local i, j, k; k:=0; j:=n; while j>0 do j:=trunc(j/10); k:=k+1; od; for i from 2 by 1 to n^2 do j:=((n*(i-1)) mod (10^k)); if j=0 then print(i, n*i); break; fi; od; end: P(624);

Adjacent sequences: A123870 A123871 A123872 this_sequence A123874 A123875 A123876

Sequence in context: A024471 A075277 A054094 this_sequence A099941 A074120 A054265

nonn

Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Oct 16 2006, Oct 24 2006