

A230453


Number of terms in the "comma sum" sequence (cf. A230288) starting with n, or 0 if it is infinite.


3



2, 1, 1, 1, 1, 122, 121, 121, 120, 120, 122, 121, 121, 120, 120, 120, 120, 119, 118, 119, 120, 120, 119, 118, 119, 118, 118, 117, 117, 117, 118, 118, 117, 117, 117, 117, 116, 116, 116, 116, 117, 116, 116, 116, 116, 115, 115, 4, 115, 4, 115, 115, 4, 115, 4, 114, 114, 114, 114, 3, 114, 114, 114, 114, 3, 3, 113, 3, 113, 2, 3, 113, 3, 113
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,1


COMMENTS

A "comma sum" sequence is such that a(n+1)a(n) = rightmost digit of a(n) + leftmost digit of a(n+1), taking usually the smallest possible solution.
The value a(0)=2 corresponds to the sequence (0,1), not to sequence A230288 starting by definition with 0,5,....
a(n)>0 for all n<396. See A230450 for the sequence starting with 396.


LINKS

Table of n, a(n) for n=0..73.


PROG

(PARI) for(n=0, 196, print1(#A230288_list([n], 150), ", ")) \\ The second argument (nMax) is useful only for n>= 396. If this value (here 150) is printed, this most probably means that the sequence is infinite, a(n)=0.


CROSSREFS

Cf. A230288, A230450, A230452.
Sequence in context: A176250 A248975 A016541 * A098876 A143277 A292378
Adjacent sequences: A230450 A230451 A230452 * A230454 A230455 A230456


KEYWORD

nonn,base


AUTHOR

M. F. Hasler, Oct 19 2013


STATUS

approved



