51067

Appears in sequences

• Number of products of distinct primes <= p(n) equal to 1 (mod p(n)).at n=22A024405
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 69 ones.at n=2A031837
• Numerators of b(n) = (1/16^n)*(4/(8*n+1) - 2/(8*n+4) - 1/(8*n+5) - 1/(8*n+6)).at n=20A048581
• a(n) = (6*n+1)*(6*n+7).at n=37A085026
• Product of the n-th sexy prime pair.at n=26A111192
• Denominator of next-best approximation to harmonic numbers. a(n) = Denominator of (A055573(n)-1)th convergent of n-th harmonic number, Sum_{k=1..n} 1/k.at n=14A113124
• a(n) = 1 - 2*n^2 + 4*n*(1 + 2*n^2)/3.at n=27A168547
• Numbers n such that exactly two positive d in the range d <= n/2 exist which divide binomial(n-d-1, d-1) and which are not coprime to n.at n=36A178098
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 339", based on the 5-celled von Neumann neighborhood.at n=42A271291
• Sequence of pairwise relatively prime numbers of class P_5 (see comment in A275246).at n=24A275249
• a(n) is the numerator of (120*n^2 + 151*n + 47)/(512*n^4 + 1024*n^3 + 712*n^2 + 194*n + 15).at n=20A374580