OFFSET
1,2
COMMENTS
All terms are odd.
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
a(5) = 3 because 3^2+4*5 = 29 is prime but 1^2+4*5 and 2^2+4*5 are not.
MAPLE
f:= proc(n) local k, m;
m:= 4*n;
for k from 1 by 2 do
if isprime(k^2+m) then return k fi
od
end proc:
map(f, [$1..200]);
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert Israel, Jun 20 2021
STATUS
approved