OFFSET
1,2
COMMENTS
The subsequence of A089270 which excludes terms divisible by 5.
LINKS
FORMULA
Numbers of the form r^2 + 3*r*s + s^2 not divisible by 5, where r and s are relatively prime and r > s >= 0.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
David Friend, Jul 20 2020
EXTENSIONS
New name and general cleanup by Charles R Greathouse IV, Sep 09 2022
STATUS
approved