A123873 Similar to A123872 but with a(0)=4 as seed.

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.

Links

Table of n, a(n) for n=0..9.

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

Adjacent sequences: A123870 A123871 A123872 * A123874 A123875 A123876

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