233289

Appears in sequences

• a(n) = (5*n^2 + 1)*n^2 / 6.at n=23A008354
• Number of numbers below 10^n with nonzero multiplicative digital root 9.at n=6A051829
• a(n) = (4*n^2 - 1)^2.at n=11A069075
• a(1) = 1, then least square such that every partial concatenation is a prime.at n=22A090257
• a(1) = 1, then least square such that every partial concatenation is a prime.at n=33A090257
• a(n) = ( n*(n+2) )^2.at n=21A099761
• Triangle T(n, k, m) = b(n,m)/(b(k,m)*b(n-k,m)), where b(n, k) = Product_{j=1..n} (1 - ChebyshevT(j, k+1)^2), b(n, 0) = n!, and m = 10, read by rows.at n=7A156646
• Triangle T(n, k, m) = b(n,m)/(b(k,m)*b(n-k,m)), where b(n, k) = Product_{j=1..n} (1 - ChebyshevT(j, k+1)^2), b(n, 0) = n!, and m = 10, read by rows.at n=8A156646
• Denominator of 1/n^2-1/(n+2)^2.at n=21A171522
• Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 1 vertically.at n=20A208114
• Odd half-Zumkeller numbers.at n=29A246199
• Number of maximal irredundant sets in the n X n bishop graph.at n=5A291060
• Odd squares k, multiples of 3 and non-multiples of 5, such that sigma(k)/k >= 5/3.at n=10A388016