68513

Appears in sequences

• Numerators of partial sums of (p+q)/p*q, where p and q are primes.at n=10A120831
• Smallest number m such that prime(n) is a factor of both m and sigma(m).at n=31A156099
• Odd numbers k which satisfy the congruence 5^(2k-1) == 3^(2k-1) (mod 2k).at n=5A215738
• Numerators of the partial sums of the reciprocals of the alternating sum of divisors function (A206369).at n=30A379619