50381

Appears in sequences

• Indices of primes at which the prime race 4k-1 vs. 4k+1 is tied.at n=15A038691
• Expansion of g.f.: (1-2*x) / ((x-1)*(4*x^2+2*x-1)).at n=10A052899
• Number of -2..2 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous.at n=10A199841
• a(n) is the smallest nonnegative integer m such that m! contains a string of exactly n consecutive 8's, or -1 if no such m exists.at n=10A254716