OFFSET
1,6
COMMENTS
Where 4(n - k) - 3 is a positive noncomposite number of the form 4m+1 (A280084).
EXAMPLE
a(6) = 2 because 4*6 = 1 + 23 where (4*5+3)/3 = 23/3 > 6 and 4*6 = 5 + 19 where (4*4+3)/3 = 19/3 > 6.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Dec 24 2016
STATUS
approved