28453

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 63.at n=37A020402
• Number of partitions in parts not of the form 21k, 21k+3 or 21k-3. Also number of partitions with at most 2 parts of size 1 and differences between parts at distance 9 are greater than 1.at n=43A035981
• Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 19.at n=15A051984
• Number of distinct values taken by 5th derivative of x^x^...^x (with n x's and parentheses inserted in all possible ways) at x=1.at n=24A199296
• Odd numbers which are factored to the same set of primes in Z as to the irreducible polynomials in GF(2)[X]; odd terms of A235036.at n=30A235039
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 790", based on the 5-celled von Neumann neighborhood.at n=36A273562
• Numbers k of the form (x + y)*(x^2 + y^2) such that (x + y) and (x^2 + y^2) are primes.at n=36A349202
• Squarefree semiprimes k such that k+1 is the product of three distinct primes and k+2 is the product of four distinct primes.at n=43A376352