1,3
Numerator and denominator in definition have no common divisors >1.
[a(1); a(2), a(3)] = 1 + 1/(1 + 1/2) = 5/3. So a(4) = 5 * 3 = 15.
Sequence in context: A068409 A096232 A193869 * A135085 A080911 A175981
Adjacent sequences: A064168 A064169 A064170 * A064172 A064173 A064174
nonn
Leroy Quet Sep 19 2001