26625

Appears in sequences

• Number of discordant permutations.at n=8A000562
• Number of similarity classes of triangles which can be drawn using the lattice points in an n X n grid for vertices.at n=21A028492
• a(n) = Sum_{i=0..n} T(i,n-i), array T as in A048149.at n=36A049712
• Triangle read by rows: T(n,k) is the number of isomorphism classes of commutative semigroups of order n with k idempotents.at n=31A058116
• Integer part of log(n^n)^(1 + log(log(1 + n))).at n=28A062479
• Composite numbers m such that phi(m)*sigma(m) is divisible by m-1.at n=31A065149
• Expansion of (1-x)^(-1)/(1+2*x^2-2*x^3).at n=24A077891
• A007318 * A131055.at n=12A131056
• Numbers of the form 56+p^2 (where p is a prime).at n=37A138690
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (1, -1, 0), (1, 0, -1), (1, 0, 1)}.at n=10A148599
• a(n) = 26*n^2 + 1.at n=32A158549
• a(n) = 2*a(n-1) - 1 with a(0)=14.at n=11A168596
• Numbers k such that k and k+1 have the same binary XOR of divisors.at n=33A227443
• Numbers k such that (14*10^k - 131)/9 is prime.at n=17A294914
• Integers i such that the equation A088387(i) = p has N > 1 solutions in the interval prevprime(i)..nextprime(i).at n=21A308617
• Total number of Fibonacci parts in all compositions of n.at n=13A309537
• a(n) = A069359(A276086(n)), where A276086 is the primorial base exp-function and A069359(n) = n * Sum_{p|n} 1/p.at n=58A329029
• Numbers k such that sigma(k)^2 is divisible by k-1.at n=27A344347
• Number of strict odd-length integer partitions of 2n.at n=38A344650