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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

%I

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

%N 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).

%C Array begins:

%C 2 1

%C 4 1

%C 6 3

%C 8 1

%C 10 5

%C 11 5

%C 12 3

%C 14 7

%C 16 1

%C 18 9

%C 22 5

%H Felix Fröhlich, <a href="/A243824/a243824_1.txt">C++ program for this sequence</a>

%e 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.

%e 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.

%Y Cf. A006960, A023109, A033665, A063048, A070788, A077594.

%K nonn,base,tabf

%O 2,1

%A _Felix Fröhlich_, Jun 11 2014

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Last modified October 22 10:24 EDT 2019. Contains 328317 sequences. (Running on oeis4.)