OFFSET
1,2
COMMENTS
It might have been more natural to start with index / offset 0. - M. F. Hasler, Jun 24 2016
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..29
EXAMPLE
The term after 16 is 2.12, i.e., 212.
MAPLE
a:= proc(n) option remember; `if`(n=1, 1, (l->
parse(cat(seq(2*l[-i], i=1..nops(l)))))(
convert(a(n-1), base, 10)))
end:
seq(a(n), n=1..20); # Alois P. Heinz, Jun 24 2016
MATHEMATICA
NestList[FromDigits[Flatten[IntegerDigits[2*IntegerDigits[#]]]] &, 1, 16] (* Jayanta Basu, May 20 2013 *)
PROG
(PARI) A061581(n=2, a=1, m=2)={while(n--, a=eval(concat(apply(t->Str(t), digits(a)*m)))); a} \\ If only the 2nd argument is given, then the operation is applied once to that argument. - M. F. Hasler, Jun 24 2016
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Amarnath Murthy, May 13 2001
EXTENSIONS
More terms from Larry Reeves (larryr(AT)acm.org) and Asher Auel, May 15 2001
STATUS
approved