23426

Appears in sequences

• a(n) = 1^2 + 3^2 + 5^2 + 7^2 + ... + (2*n-1)^2 = n*(4*n^2 - 1)/3.at n=26A000447
• Even tetrahedral numbers.at n=38A015220
• Binomial coefficients C(n,50).at n=3A017714
• Binomial coefficients C(53,n).at n=3A017769
• a(n) = (prime(n)-3)*(prime(n)-5)*(prime(n)-7)/48.at n=27A030003
• a(n) = (prime(n) - 1)*(prime(n) - 3)*(prime(n) - 5)/48.at n=26A030004
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 18.at n=16A031696
• Squarefree tetrahedral numbers.at n=16A070755
• Euler transform of A002487.at n=22A071019
• Antidiagonal sums of A086272 (and of A086273).at n=25A086274
• Sum of n-th prime squared and n-th perfect square.at n=34A106587
• a(n) = binomial(prime(n+2), 3).at n=14A126995
• Number of partitions of n into parts that are odd or == +- 2 (mod 10).at n=47A133153
• Tetrahedral numbers k*(k+1)*(k+2)/6 such that exactly one of k, k+1, and k+2 is prime.at n=29A144521
• Sequence related to Hankel transform of super-ballot numbers.at n=24A156126
• Expansion of (2-6*x)/(1-12*x+11*x^2).at n=4A156341
• a(n) = 289*n^2 + 17.at n=9A158585
• Denominators of ((n+3)/(n+2)/(n+1)/n) (sorted with no repeats).at n=35A168062
• Number of weighted lattice paths in L_n having no (1,0)-steps at level 0. The members of L_n are paths of weight n that start at (0,0) , end on the horizontal axis and whose steps are of the following four kinds: an (1,0)-step with weight 1, an (1,0)-step with weight 2, a (1,1)-step with weight 2, and a (1,-1)-step with weight 1. The weight of a path is the sum of the weights of its steps.at n=15A182894
• Number of (w,x,y) with all terms in {0,...,n} and w != min(|w-x|, |x-y|, |y-w|).at n=28A213492