68078

Appears in sequences

• [ exp(11/21)*n! ].at n=7A030845
• Conjectured largest number having n representations as the sum of two twin primes p + q with p >= q.at n=5A212613
• Numbers k such that 3*R_k + 20 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=16A256463
• a(n) = a(n-1) + a(n-2) + a([2n/3]), where a(0) = 1, a(1) = 2, a(2) = 3.at n=19A298343
• a(1) = 1, a(2) = 2, a(3) = 3; for n > 3, a(n) is the smallest positive number which has not appeared such that all the distinct prime factors of a(n-3) + a(n-2) + a(n-1) are factors of a(n).at n=33A361593