22537

Appears in sequences

• Numbers k > 1 such that k mod ord2(k) is even, where ord2(k) is the order of 2 mod k.at n=34A036260
• a(n) = a(1) + a(2) + ... + a(n-1) - a(m) for n >= 4, where m = 2*n - 3 - 2^(p+1) and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), starting with a(1) = 1, a(2) = 2, and a(3) = 4.at n=16A049912
• a(n) = sum of the absolute values of the coefficients in (1+x-x^3)^n.at n=10A195417
• Gray code of Fibonacci(n).at n=23A255919
• Number of nX3 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=13A302158
• a(n) is the numerator of Sum_{k = 0..n} fusc(k)/fusc(k+1) (where fusc is Stern's diatomic series A002487).at n=21A355075