287891
domain: N
Appears in sequences
- Generalized Fibonacci numbers: a(n) = a(n-1) + 10*a(n-2).at n=10A015446
- Numbers k such that k and k^2 use only the digits 1, 2, 7, 8 and 9.at n=23A137018
- a(n) = (4*n + 1)^(1/2)/(4*n + 1)*((1 - p)*q^n - (1 - q)*p^n), where p = (1 - (4*n + 1)^(1/2))/2 and q = (1 + (4*n + 1)^(1/2))/2.at n=9A171180
- Numbers k such that k, k+1, k+2, k+3 and k+4 are terms of A288041.at n=21A336221