26857
domain: N
Appears in sequences
- Pisot sequence T(5,21), a(n) = floor( a(n-1)^2/a(n-2) ).at n=6A010925
- a(n) = 4*a(n-1) + a(n-2) - a(n-3) - a(n-5).at n=6A019992
- a(1) = 1; a(n+1) = 1 + Product_{k|n} a(k), product is over the positive divisors, k, of n.at n=10A068334
- Main diagonal of array in A083140.at n=27A083141
- Odd composites (including 1 in the count) where the number 1 mod 4 equals the number 3 mod 4.at n=3A093180
- Expansion of 1/sqrt((1-x)^2-12x^4).at n=14A098484