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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).
Sequence in context: A178968 A006613 A204221 * A337308 A014134 A085989
KEYWORD
nonn
AUTHOR
Wesley Ivan Hurt, Oct 09 2021
STATUS
approved

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Last modified May 29 05:33 EDT 2024. Contains 372921 sequences. (Running on oeis4.)