66961

Appears in sequences

• Numerator of sum_{p prime, p-1 divides 2*n} 1/p.at n=32A027761
• Denominator of Bernoulli_n multiplied by the sum of the associated inverse primes in the Staudt-Clausen theorem, n=1, 2, 4, 6, 8, 10,...at n=33A166306
• a(n) is the upper end of a record gap A349995(n) between consecutive odd squarefree semiprimes (A046388).at n=11A350099