18324

Appears in sequences

• a(n) is the decimal concatenation of n and n^2.at n=17A053061
• Sixth column of triangle A055252.at n=7A055582
• Triangular array formed by the Mersenne numbers.at n=47A110441
• Triangle read by rows, A007318 * A153198.at n=52A153199
• Number of Fermat pseudoprimes to base 2 between 2^n and 2^(n+1) that are not Carmichael numbers.at n=37A252943
• Numbers k that end with ( sum of digits of k )^2.at n=25A270343
• Sum of the largest parts of the partitions of n into 4 parts.at n=47A308760
• Numbers k such that the largest prime divisor of k^4+1 is less than k.at n=22A309562
• Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.at n=13A318078
• T(n, k) = binomial(2*n - 1 - k, k - 1)*hypergeom([2, 2, 1-k], [1, 1 - 2*k + 2*n], -1), triangle read by rows, T(n, k) for n >= 1 and 1 <= k <= n.at n=52A320905
• Expansion of e.g.f. 1/(1 + x/3 * log(1 - 3 * x)).at n=6A354316