83811

Appears in sequences

• Expansion of 1/((1-4x)(1-5x)(1-8x)(1-10x)).at n=4A028121
• a(n) = (n^2 - n + 1)*(n^2 + n + 1).at n=17A059826
• Sum of squares of divisors of square numbers.at n=16A065827
• Jordan function ratio J_6(n)/J_2(n).at n=16A194532
• a(0)=0, a(1)=1, a(2n)=17*a(n), a(2n+1)=a(2n)+1.at n=21A197351
• Central polygonal numbers that are nontrivially the product of two central polygonal numbers.at n=21A203173
• Number of n X 2 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..2 n X 2 array.at n=39A219211
• Array t(n,k) of sum of successive even powers of primes, where t(n,k) = sum_(j=0..k-1) prime(n)^(2j), with n>=1 and k>=0, read by ascending antidiagonals.at n=48A241855
• Numbers k such that (8*10^k - 101)/3 is prime.at n=21A294121
• Composite numbers of the form k^2+k+1 all of whose prime factors are of that same form.at n=14A353056