19829

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+8).at n=22A015876
• Fibonacci sequence beginning 5, 17.at n=16A022141
• Sum_{ k=1 ... floor(n/2) } A023532(k)*Fib(n-k).at n=20A024371
• s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A023532, t = (F(2), F(3), F(4), ...).at n=18A025071
• Number of 0..n arrays x(0..6) of 7 elements with zero 4th differences.at n=33A200274
• Numbers that can be written in more than 1 way as p^2 + 3pq + q^2 with primes p < q.at n=11A218795
• Numbers n such that the sum of the numbers in the Collatz (3x+1) iteration of n is a perfect square.at n=42A225866
• Numbers k such that 4 is the smallest decimal digit of k^3.at n=31A291643
• Number of compositions (ordered partitions) of n into distinct parts >= 5.at n=50A339103