458010

Appears in sequences

• Numbers k such that sigma(k) + sigma(k+1) = 4k.at n=2A068077
• Numbers k such that (sigma(k)+sigma(k+1))/k is an integer.at n=11A068078
• Numbers k that divide sigma(k-1)+sigma(k)+sigma(k+1), where sigma() is the "sum of integer divisors" function.at n=8A072188
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (1, 0, 0), (1, 0, 1), (1, 1, 1)}.at n=9A151174
• a(n) = Sum_{k=0..n} 3^(n-k) * binomial(n+4,k+4) * binomial(2*k+8,k+8).at n=5A387277