26480

Appears in sequences

• Arithmetic derivative of (prime(n)+1)*(prime(n+1)+1)/4.at n=42A079094
• Numbers n such that 2*10^n + 6*R_n + 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=20A102957
• Expansion of f(q)*f(q^7)/(f(-q)*f(-q^7)) in powers of q where f() is a Ramanujan theta function.at n=39A123862
• Products of distinct numbers in A052963.at n=45A274453
• Total number of covered falling diagonals in all n X n permutation matrices.at n=7A306455
• Triangle T(n,k), read by rows: coefficients for numerical integration near a singularity (n >= 0 and 0 <= k <= n).at n=24A324124
• a(n) is the largest number that can be expressed as the sum of three triangular numbers in exactly n ways.at n=17A330810
• a(n) is the largest number that can be expressed as the sum of three positive triangular numbers in exactly n ways.at n=18A330811
• Triangular array read by rows: T(n, k) = number of occurrences of 2k as a sum |1 - p(1)| + |2 - p(2)| + ... + |n - p(n)|, where (p(1), p(2), ..., p(n)) ranges through the permutations of (1,2,...,n), for n >= 1, 0 <= k <= n-1.at n=62A357329
• a(n) is the largest number t such that there exist numbers i,j,k such that, for all m <= t, there exist integers x,y,z with x*i + y*j + z*k = m and |x|+|y|+|z| <= n.at n=40A383579