27868

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 98 ones.at n=35A031866
• a(n) = 961*n - 1.at n=28A158412
• Numbers k such that 5^k mod 2^k is prime.at n=31A178996
• a(n) = n^3 - 2*n^2 - 1.at n=30A214731
• Numbers n for which number of iterations to reach the largest equals number of iterations to reach 1 from the largest in Collatz (3x+1) trajectory of n.at n=30A224303
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 726", based on the 5-celled von Neumann neighborhood.at n=39A273451
• G.f.: Product_{k>=1} (1 + x^(k*(k+1)/2)) / (1 - x^k).at n=31A280421
• Expansion of Product_{k>=1} (1 + x^k)^(d(k)-1), where d(k) = number of divisors of k (A000005).at n=42A318844
• Number of loop-graphical integer partitions of 2n.at n=21A339656