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A243824
Two-column 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
OFFSET
2,1
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.
Array begins:
2 1
4 1
6 3
8 1
10 5
11 5
12 3
14 7
16 1
18 9
22 5
CROSSREFS
KEYWORD
nonn,base,tabf,more
AUTHOR
Felix Fröhlich, Jun 11 2014
STATUS
approved