273650

Appears in sequences

• Fibonacci sequence beginning 0, 25.at n=21A022359
• Beach-Williams Pell numbers of type 2pqrs (p,q,r,s primes).at n=18A212077
• For every positive integer m, let u(m) = (d(1),d(2),...,d(k)) be the unitary divisors of m. The sequence (a(n)) consists of integers of the form d(k)/d(1) + d(k-1)/d(2) + ... + d(k)/d(1).at n=27A229999
• a(n) = L(2*F(n)) + L(2*F(n+1)), where L(n) is the n-th Lucas number (A000032), and F(n) is the n-th Fibonacci number (A000045).at n=6A356760