20433

Appears in sequences

• arcsinh(arcsin(sinh(x)))=x+1/3!*x^3+9/5!*x^5+337/7!*x^7+20433/9!*x^9...at n=4A012105
• Define the sequence T(a(0),a(1)) by a(n+2) is the greatest integer such that a(n+2)/a(n+1) < a(n+1)/a(n) for n >= 0. This is T(3,7).at n=11A019489
• Define the sequence T(a(0),a(1)) by a(n+2) is the greatest integer such that a(n+2)/a(n+1) < a(n+1)/a(n) for n >= 0. This is T(16,36).at n=9A022040
• Numbers k such that the k-th Fibonacci number reversed is prime.at n=28A036971
• Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 3,1,0,2.at n=4A037777
• Numbers k such that sopf(k) = sopf(k+3), where sopf(k) = A008472(k).at n=24A063969
• a(n) = s(2*n) where s(0) = 0, s(1) = s(2) = 1, s(n) = abs(Sum_{k=2..n-1} (-1)^k * s(n-k) * s(k)).at n=45A072851
• Expansion of (1-x)^(-1)/(1-2*x-x^3).at n=12A077852
• a(n) is the sum of the Wieferich and Wall-Sun-Sun residues of prime(n).at n=33A339639
• Numbers k such that 2^sigma(k) - k is a prime.at n=12A368651