OFFSET
2,3
COMMENTS
If there is a number m such that the reversal of m in base n is c times m, then c is called a reverse multiplier for n. For example, 2 is a reverse multiplier for base n=5, since 8 (base 10) = 13 (base 5), and 2*8 = 16 (base 10) = 31 (base 5).
The trivial reverse multiplier 1 is included.
The last entry in each row is n-1; the number of terms in row n is A222820(n).
REFERENCES
For a complete list of references and links related to this problem see A214927.
LINKS
N. J. A. Sloane, Table giving n, number of nontrivial reverse multipliers, list of nontrivial reverse multipliers, for n = 3..50
N. J. A. Sloane, 2178 And All That, arXiv:1307.0453 [math.NT], 2013; Fib. Quart., 52 (2014), 99-120.
Anne Ludington Young, k-Reverse multiples, Fib. Q., 30 (1992), 126-132.
EXAMPLE
Triangle begins:
1,
1,2,
1,3,
1,2,4,
1,2,5,
1,3,6,
1,2,3,5,7,
1,2,4,8,
1,4,9,
1,2,3,5,7,10,
1,2,3,5,11,
1,5,6,12,
1,2,3,4,6,9,13,
1,2,3,4,7,11,14,
1,3,7,15
...
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
N. J. A. Sloane, Mar 13 2013
STATUS
approved