21278

Appears in sequences

• a(n) = (1/3)*n^3 - n^2 - (1/3)*n - 1.at n=41A109620
• Monotonic ordering of set S generated by these rules: if x and y are in S then 3xy-x-y is in S, and 2 is in S.at n=19A192529
• Conjectured largest number having n representations as the sum of two twin primes p + q with p >= q.at n=3A212613
• Number of misère-play left dead end games born by day n.at n=5A368588