

A262873


Predestined numbers A262743 in which every term is generated by at least one pair of products where all (and only those) first product's factor's digits are, in reverse order, the same as those of the second two factors.


3



504, 756, 806, 868, 1008, 1148, 1176, 1209, 1472, 1475, 1512, 1638, 1708, 2016, 2184, 2208, 2418, 2548, 2730, 2772, 2924, 3024, 3388, 4416
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

In this sequence, the position of the multiplication sign in the reversed order is irrelevant, so, e.g., 11088 (48*231 and 132*84), 1176 (4*294 and 49*24) and 2548 (4*637 and 7*364) are in the sequence.


REFERENCES

Francesco Di Matteo, Sequenze ludiche, Game Edizioni (2015), page 34.


LINKS



EXAMPLE

504 = 12*42 = 24*21;
756 = 12*63 = 36*21;
806 = 13*62 = 26*31;
868 = 4*217 = 7*124;
1008 = 12*84 = 48*21;
1148 = 14*82 = 28*41;
1176 = 4*294 = 49*24, etc.


CROSSREFS

Cf. A228164 (contains only symmetrical digits' factors)


KEYWORD

nonn,base


AUTHOR



STATUS

approved



