26650

Appears in sequences

• Numbers that are the sum of 2 nonzero squares in exactly 6 ways.at n=21A025289
• Numbers that are the sum of 2 nonzero squares in 5 or more ways.at n=30A025296
• Numbers that are the sum of 2 nonzero squares in 6 or more ways.at n=21A025297
• Numbers that are the sum of 2 distinct nonzero squares in exactly 6 ways.at n=21A025307
• Numbers that are the sum of 2 distinct nonzero squares in 5 or more ways.at n=28A025315
• Numbers that are the sum of 2 distinct nonzero squares in 6 or more ways.at n=21A025316
• Even 10-gonal (or decagonal) numbers.at n=41A028994
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 36.at n=2A031624
• 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=21A097103
• Central terms of triangle A114172 found in even-indexed rows.at n=6A114174
• Decagonal numbers divisible by 10.at n=17A117797
• Numbers n such that 1 + Sum{k=1..n/2} A001223(2k-1)*(-1)^k = 0.at n=22A130642
• Numbers n such that 1 - S(n) = 0, where S(n) = (S(n-1) + A000040(n))*(-1)^n; S(0)=0, n=>1.at n=27A131197
• Denominators of Integral_{x=0..1} cos(log(x))^n dx.at n=9A180092
• Beach-Williams Pell numbers of type 2pqrs (p,q,r,s primes).at n=1A212077
• G.f.: 1/( (1-8*x)*(1+x)^2 )^(1/3).at n=6A216316
• a(n) = 5*binomial(8*n+10,n)/(4*n+5).at n=4A230390
• a(n) = Sum_{i=0..n} digsum(i)^3, where digsum(i) = A007953(i).at n=55A231688
• a(n) is the number of size n Eulerian orientations in L1(1).at n=6A278459
• a(n) = (n-1)*(n-2)*(n^2+9*n+12)/24.at n=27A323847