19212

Appears in sequences

• Antidiagonal sums of A147995 and A163545.at n=29A163484
• Numbers k such that 3^k + 100 is prime.at n=45A219618
• Numbers n such that the sum of the numbers in the Collatz (3x+1) iteration of n is a perfect square.at n=41A225866
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 193", based on the 5-celled von Neumann neighborhood.at n=31A270687
• Numbers k such that k^7 - 1 and k^7 + 1 are semiprimes.at n=4A279272
• Number of semi-magic (only short lines are magic) knight's tours on a 4 X n board.at n=15A309273
• a(n) is the total surface area of a hollow cubic block (defined as a block with a shell thickness of 1 cube) where n is the edge length of the removed volume.at n=38A309842
• Number of semi-magic (only short lines are magic) knight's tours on a 4 X 2n board.at n=7A328816
• Members of A014574 with sum of prime factors (with multiplicity) also in A014574.at n=17A349455