2521695

Appears in sequences

• Solutions k of the equation cototient(k) = cototient(k-1) + cototient(k-2) where cototient(k) is A051953.at n=16A332972
• a(n) is the denominator of the sum of reciprocals of primes not exceeding n and not dividing binomial(2*n, n).at n=35A334075