login
A123873
Similar to A123872 but with a(0)=4 as seed.
1
4, 6, 26, 126, 3126, 15625001, 156250000000001, 15625000000000000000000000001, 156250000000000000000000000000000000000000000000000000001, 156250000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
OFFSET
0,1
REFERENCES
G. Balzarotti and P. P. Lava, Le sequenze di numeri interi, Hoepli, 2008, p. 99.
EXAMPLE
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.
MAPLE
P:=proc(q, h) local a, b, k, n; a:=h; b:=ilog10(a)+1; print(h);
for k from 1 to 10 do for n from 2 to q do
if ((a*n) mod 10^b)=a then print(n); a:=a*n; b:=ilog10(a)+1;
break; fi; od; od; end: P(10^9, 4);
CROSSREFS
Sequence in context: A159557 A176756 A054094 * A193689 A099941 A074120
KEYWORD
nonn,base
AUTHOR
Paolo P. Lava and Giorgio Balzarotti, Oct 16 2006, Oct 24 2006
EXTENSIONS
More terms from Bert Dobbelaere, Aug 08 2023
STATUS
approved