83028

Appears in sequences

• a(n) = floor(C(n+8,8)/C(n+2,2)).at n=29A084631
• Triangle T, read by rows, such that T(n,k) equals the (n-k)-th row sum of T^k, where T^k is the k-th power of T as a lower triangular matrix.at n=58A091351
• Row sums of the matrix cube of triangle A091351, in which the k-th column lists the row sums of A091351^k (the k-th power of A091351 when considered as a lower triangular matrix).at n=7A091354
• Triangle, read by rows, such that T(n,k) equals the k-th term of the convolution of the (n-1)-th diagonal with the k-th row of this triangle.at n=62A098446
• Triangular matrix T, read by rows, that satisfies: SHIFT_LEFT_UP(T) = T^2 - T + I, or, equivalently: T(n+1,k+1) = [T^2](n,k) - T(n,k) + [T^0](n,k) for n>=k>=0, with T(0,0)=1.at n=69A104445
• Triangular numbers that are the product of 2 palindromes greater than 1.at n=37A115744
• Numbers k such that k divides 1 + Sum_{j=1..k} prime(j)^2 = 1 + A024450(k).at n=26A128166
• Numbers k such that k*(k+1)-1 and k*(k+1)+1 are twin primes and k*(k+3)-1 and k*(k+3)+1 are also twin primes.at n=33A138303
• Cyclops triangular numbers.at n=18A160717
• a(n) = m*(m+1)/2, where m = floor(n^(3/2)).at n=54A185541
• Number of (w,x,y,z) with all terms in {1,...,n} and min{|w-x|,|w-y|}=min{|x-y|,|x-z|}.at n=36A212579
• a(n) = A000217(A000217(n)+1).at n=28A267707
• The first of two consecutive triangular numbers the sum of which is equal to the sum of two consecutive prime numbers.at n=25A298462
• Numbers k such that k, k^2-1 and k^2+1 are all fine, where a number m is fine if its prime factors are all less than m^(1/3).at n=21A345896
• Number of irreducible conic curves containing 6 points of a cyclic order n-torsion subgroup of an elliptic curve.at n=32A379920