163020

Appears in sequences

• Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n-2)/3.at n=42A048026
• Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= (n-3)/3.at n=42A048037
• Values of B (the even leg) of a Pythagorean triangle with A and C both prime and part of a twin prime.at n=9A051858
• Even legs of Pythagorean triangles whose other leg and hypotenuse are both prime.at n=22A067755
• Expansion of 1/((1-x^2)*(1-4*x+x^2)).at n=9A072335
• First occurrence (*2) of n in A088627 - or - least number that yields n different primes if you factorize it in all possible ways in two factors and add these factors.at n=26A091350
• Coefficients of the series giving the best rational approximations to sqrt(3).at n=4A123480
• Numbers with prime factorization pqrstu^2.at n=19A189985
• T(n,k) is the number of arrays of n+2 elements from {0,1,...,k} with no two consecutive ascents.at n=42A200785
• Number of 0..n arrays x(0..8) of 9 elements without any two consecutive increases.at n=2A200791
• T(n,k)=Number of length n+k 0..3 arrays with at most one downstep in every k consecutive neighbor pairs.at n=34A258730
• Number of length n+7 0..3 arrays with at most one downstep in every n consecutive neighbor pairs.at n=1A258737
• a(n) = Sum_{k=0..floor(n/4)} binomial(n-3*k-1,k) * binomial(k,n-4*k).at n=44A383584