

A348277


Numbers k such that s' + t' = k = s + t, for some s,t in 1 <= s <= t.


0



8, 13, 17, 25, 27, 28, 31, 32, 33, 36, 49, 54, 57, 69, 72, 73, 81, 93, 97, 99, 112, 121, 125, 129, 135, 139, 141, 153, 165, 169, 177, 181, 193, 199, 203, 207, 208, 217, 224, 241, 247, 249, 250, 259, 273, 279, 285, 289, 297, 304, 311, 317, 321, 324, 325, 331, 333, 337, 343
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

Here, the notation m' denotes the arithmetic derivative of m (A003415).


LINKS



EXAMPLE

13 is in the sequence since 13 = 5 + 8 and 5' + 8' = 1 + 12 = 13, with 1 <= 5 <= 8.
25 is in the sequence since 25 = 5 + 20 and 5' + 20' = 1 + 24 = 25, with 1 <= 12 <= 14.


CROSSREFS

Cf. A003415 (arithmetic derivative).


KEYWORD

nonn


AUTHOR



STATUS

approved



