1,3

Numerator and denominator in definition have no common divisors >1.

Table of n, a(n) for n=1..7.

[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 A290042 A080911

Adjacent sequences: A064168 A064169 A064170 * A064172 A064173 A064174

nonn

Leroy Quet, Sep 19 2001

approved