30439

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 23 ones.at n=22A031791
• Bell triangle A011971 squared.at n=18A095799
• Least j > 1 such that j^2 = (4*n^2 + 2)*(k^2) + (4*n^2 + 2)*k + 1.at n=19A106231
• a(n) = t(n)_t(n) where t() = triangular numbers A000217.at n=17A122628
• Number of n X 3 arrays of the minimum value of corresponding elements and their horizontal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 n X 3 array.at n=27A219768
• Expansion of (g/(1 - x*g))^2, where g = 1+x*g^4 is the g.f. of A002293.at n=6A391275