

A243824


Twocolumn array A(n,s) of pairs (n,s) read by row where s is the smallest seed number such that the Reverse and Add! trajectory of s contains n (excluding cases where n=s).


1



2, 1, 4, 1, 6, 3, 8, 1, 10, 5, 11, 5, 12, 3, 14, 7, 16, 1, 18, 9, 22, 5
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OFFSET

2,1


COMMENTS

Array begins:
2 1
4 1
6 3
8 1
10 5
11 5
12 3
14 7
16 1
18 9
22 5


LINKS

Table of n, a(n) for n=2..23.
Felix Fröhlich, C++ program for this sequence


EXAMPLE

A(10,1)=16 is in the array because 16 is the 9th number appearing in the Reverse and Add! trajectory of a smaller number.
A(10,2)=1 is in the array because 1 + 1 = 2, 2 + 2 = 4, 4 + 4 = 8, 8 + 8 = 16, so 1 is the smallest seed number whose Reverse and Add! trajectory contains 16.


CROSSREFS

Cf. A006960, A023109, A033665, A063048, A070788, A077594.
Sequence in context: A271773 A277127 A118275 * A146938 A147418 A146386
Adjacent sequences: A243821 A243822 A243823 * A243825 A243826 A243827


KEYWORD

nonn,base,tabf


AUTHOR

Felix Fröhlich, Jun 11 2014


STATUS

approved



