31889

Appears in sequences

• Numbers generated by a Fibonacci-like sequence in which zeros are suppressed.at n=44A243063
• Numbers k such that (5*10^k - 143)/3 is prime.at n=27A271821
• Number of nX4 0..1 arrays with every element equal to 0, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=27A303321
• a(n) gives the number of squares in the n-th iteration of the Harter-Heighway dragon.at n=13A339739
• Triangle read by rows: T(n,k) = Sum_{j=k..n} binomial(n + j, n)*binomial(n, j)/(j + 1).at n=41A351385
• Numerators of the partial alternating sums of the reciprocals of the sum of bi-unitary divisors function (A188999).at n=22A379617