OFFSET
1,2
COMMENTS
The resulting sequence shows the multiplications that have been done, where the "," becomes the multiplication operator. E.g., ...,312,48,... shows that at this point the digit '2' occurred for the 4th time and the calculation was 2*4=8. At the next occurrence one would get 2 x 5 = 10 which is forbidden, so the counter is set to 6, which yields the 432,612 <=> 2*6=12.
LINKS
E. Angelini, Concatenating multiplications and successive results, post to SeqFan list, Nov 04 2013
PROG
(PARI) c=vector(9); a=1; for(n=1, 99, print1(a", "); d=a%10; until(P%10, P=d*c[d]++); a=eval(Str(c[d], P)))
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and M. F. Hasler, Nov 04 2013
STATUS
approved