48081

Appears in sequences

• a(n) = [ a(n-1)/a(1) ] + [ a(n-1)/a(2) ] + ... + [ a(n-1)/a(n-1) ] for n >= 3, with initial terms 1,1.at n=12A022855
• Numbers k such that 8*10^k - 9 is prime.at n=22A103068
• Triangular matrix T, read by rows, that satisfies: [T^-1](n,k) = -(k+1)*T(n-1,k) when (n-1)>=k>=0, with T(n,n) = 1 and T(n+1,n) = (n+1) for n>=0.at n=30A106208
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+119)^2 = y^2.at n=33A129837
• E.g.f.: exp(x/(1 - 4*x)).at n=5A321847
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. exp(x/(1-k*x)).at n=50A341033