31831

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 61 ones.at n=1A031829
• Table read by antidiagonals: T(n,k) = number of labeled partitions of (n,k) into pairs (i,j).at n=49A108470
• Table read by antidiagonals: T(n,k) = number of labeled partitions of (n,k) into pairs (i,j).at n=50A108470
• Number of partitions of the set {1,2,...,n} having no blocks with all entries of the same parity.at n=11A124425
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0010-1010-1111 pattern in any orientation.at n=11A146778
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 427", based on the 5-celled von Neumann neighborhood.at n=14A282105