OFFSET
1,2
EXAMPLE
For 12, A003415(12) = 12' = 16, an even number, but on the other hand, for its factors 2 and 6, neither has even derivative as 2' = 1, 6' = 5, while for its factors 3 and 4 only the other factor has even derivative, as 3' = 1, 4' = 4, so 12 has no nontrivial pair of factors such that both of them would have even arithmetic derivative, and therefore 12 is included in this sequence.
PROG
(PARI) isA359829(n) = A359828(n);
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 17 2023
STATUS
approved