The On-Line Encyclopedia of Integer Sequences (OEIS)

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A230453

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

#7 by Bruno Berselli at Wed Oct 23 05:17:18 EDT 2013

STATUS

editing

approved

#6 by Bruno Berselli at Wed Oct 23 05:17:14 EDT 2013

COMMENTS

a(n)>0 for all n<396. See A230540 A230450 for the sequence starting with 396.

STATUS

approved

editing

#5 by N. J. A. Sloane at Sat Oct 19 10:18:07 EDT 2013

STATUS

editing

approved

#4 by N. J. A. Sloane at Sat Oct 19 10:17:48 EDT 2013

CROSSREFS

Cf. A230288, A230450, A230452.

STATUS

proposed

editing

Discussion

Sat Oct 19

10:18

N. J. A. Sloane: Added cross-references to related sequences.

#3 by M. F. Hasler at Sat Oct 19 02:13:21 EDT 2013

STATUS

editing

proposed

#2 by M. F. Hasler at Sat Oct 19 02:11:57 EDT 2013

NAME

allocated for M. F. Hasler

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

DATA

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

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 A230540 for the sequence starting with 396.

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.

KEYWORD

allocated

nonn,base

AUTHOR

M. F. Hasler, Oct 19 2013

STATUS

approved

editing

#1 by M. F. Hasler at Sat Oct 19 02:11:57 EDT 2013

NAME

allocated for M. F. Hasler

KEYWORD

allocated

STATUS

approved