OFFSET
1,1
COMMENTS
Lucas numbers with indices 2, 4, 5 mod 6 are 3 mod 4, so these are all terms. - Charles R Greathouse IV, Jan 11 2023
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..958
FORMULA
phi^n < a(n) < phi^(2n) for n > 4. - Charles R Greathouse IV, Jan 11 2023
MAPLE
R:= NULL: count:= 0:
a:= 2: b:= 1:
for i from 1 while count < 100 do
a, b:= b, a+b;
if ormap(t -> t[2]::odd and t[1] mod 4 = 3, ifactors(b)[2]) then
R:= R, b; count:= count+1
fi
od:
R; # Robert Israel, Jan 10 2023
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Chai Wah Wu, Jan 10 2023
STATUS
approved