OFFSET
1,5
COMMENTS
Conjecture: a(n) > 0 for n >= 3.
EXAMPLE
a(5) = 2 because 2*5 - 4*0 - 3 = 7 is prime where 4*0 + 3 = 3 is prime of the form 4k+3 and 2*5 - 4*1 - 3 = 3 is prime where 4*1 + 3 = 7 is prime of the form 4k+3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Dec 31 2016
STATUS
approved