19649

Appears in sequences

• Centered octahedral numbers (crystal ball sequence for cubic lattice).at n=24A001845
• Numbers n such that sopf(n) = sopf(n-1) + sopf(n-2), where sopf(x) = sum of the distinct prime factors of x.at n=9A075565
• Indices of primes in sequence defined by A(0) = 39, A(n) = 10*A(n-1) - 61 for n > 0.at n=15A101831
• a(n) = 3^n - Fibonacci(n).at n=9A212323
• Numbers n such that the n-th Lucas number is prime and can be written in the form a^2 + 7*b^2.at n=19A216537
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 662", based on the 5-celled von Neumann neighborhood.at n=40A273390
• Number of partitions of n such that the (sum of distinct odd parts) > n/2.at n=45A284614
• a(n) is the smallest number k such that 2k - sigma(k) = 2^n.at n=13A292557
• Numbers that are the sum of seven fifth powers in two or more ways.at n=20A345605
• Numbers that are the sum of seven fifth powers in exactly two ways.at n=20A346279