23128

Appears in sequences

• a(n) = dot_product(1,2,...,n)*(4,5,...,n,1,2,3).at n=38A026040
• dot product (n,n-1,...2,1).(3,4,...,n,1,2).at n=46A026054
• Number of partitions in parts not of the form 19k, 19k+1 or 19k-1. Also number of partitions with no part of size 1 and differences between parts at distance 8 are greater than 1.at n=48A035970
• a(1) = 1, a(n+1) is the sum of a(n) and floor( arithmetic mean of a(1) ... a(n) ).at n=42A065094
• a(n) = (3*n+1)*(5*n+1).at n=39A144459
• Column 0 of the matrix square of triangle A167015.at n=6A167142
• Number of strings of numbers x(i=1..6) in 0..n with sum i^3*x(i)^2 equal to 216*n^2.at n=41A184307
• a(n) = 8*a(n-1) - 5*a(n-2), with a(0)=0, a(1)=1.at n=6A190977
• Numbers k such that P = 2^k - 1 - Sum_{primes p<k} 2^(p-1) is prime.at n=23A215891
• Row sums of triangle in A144480.at n=12A245560
• Main diagonal of square arrays A114881 and A249741.at n=25A249743
• Partial sums of A299291.at n=26A299292
• Triangle read by rows: T(n,k) = Sum_{i=0..n/2} C(n-i,i)*C(n-i,k-i)*C(n-1,i) (0 <= k <= n).at n=49A306226
• Numbers k such that there are exactly four biquadratefree powerful numbers (A338325) between k^2 and (k+1)^2.at n=19A338391