21074

Appears in sequences

• a(n) = floor(n*phi^14), where phi is the golden ratio, A001622.at n=25A004929
• Sum of fourth powers of unitary divisors.at n=11A034678
• Number of (w,x,y) with all terms in {0,...,n} and the numbers w,x,y,|w-x|,|x-y| distinct.at n=30A213490
• Number of 2 X 2 matrices with all elements in 0..n such that the sum of the elements is prime.at n=16A281550
• Numbers k such that Bernoulli number B_{k} has denominator 498.at n=27A282773
• a(1) = 15; for n > 1, a(n)^2 is the smallest square that begins with a(n-1) in base 6.at n=17A336251