31525

Appears in sequences

• Numbers that are the sum of 2 nonzero squares in exactly 6 ways.at n=29A025289
• Numbers that are the sum of 2 nonzero squares in 6 or more ways.at n=30A025297
• Numbers that are the sum of 2 distinct nonzero squares in exactly 6 ways.at n=29A025307
• Numbers that are the sum of 2 distinct nonzero squares in 6 or more ways.at n=30A025316
• Row sums in A083175.at n=24A083175
• Numbers m that are the hypotenuse of exactly 22 distinct integer-sided right triangles, i.e., m^2 can be written as a sum of two squares in 22 ways.at n=30A097103
• a(n) = (4*n^3 + n^2 - 3*n)/2.at n=25A172073
• a(n) = prime(n)*T(n), where T = A000217.at n=24A196421
• Number of n X 2 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.at n=28A229439
• Number of length n+2 0..4 arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero.at n=4A250557
• T(n,k)=Number of length n+2 0..k arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero.at n=32A250561
• Number of length 5+2 0..n arrays with the sum of second differences multiplied by some arrangement of +-1 equal to zero.at n=3A250564
• Numbers m such that m = p^2 + k^2, with p > 0, where p = A007954(m) = the product of digits of m.at n=27A334557
• a(n) = Sum_{d|n} lcm(sigma(d), pod(d)) where sigma(k) is the sum of divisors of k (A000203) and pod(k) is the product of divisors of k (A007955).at n=33A334794
• Irregular triangle read by rows: T(n,k) is the coefficient of x^k in the domination polynomial of the n X n torus grid graph (n>=1, A094087(n)<=k<=n^2).at n=27A378418