54785

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 15.at n=34A031603
• Number of decimal digits of Lucas(2^n).at n=18A094057
• Number of singular 2 X 2 matrices having all elements in {-n,...,n}.at n=34A209981
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^2+x^2+y^2>n.at n=38A211640
• a(1) = 0 and a(n+1) > a(n) is the smallest integer such that a(n+1)^2-a(n)^2 is triangular.at n=28A358416
• Number of subsets of the first n nonzero tetrahedral numbers whose sum is a nonzero tetrahedral number.at n=24A378170
• Number of digits in the decimal expansion of Fibonacci(2^n).at n=18A385248