A243824 - OEIS

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).

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

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.

Array begins:

2 1

4 1

6 3

8 1

10 5

11 5

12 3

14 7

16 1

18 9

22 5