-1005

Appears in sequences

• a(0)=1, a(1)=3,a(n)=6*a(n-2)-a(n-1).at n=8A165405
• Values of n such that L(5) and N(5) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=35A226925
• a(n) = n - 2^(sum of digits of n).at n=19A328882