61760

Appears in sequences

• Ruth-Aaron numbers (1): sum of prime divisors of n = sum of prime divisors of n+1.at n=34A006145
• Number of ways to place 4 nonattacking queens on a 4 X n board.at n=20A061990
• Number of nonequivalent solutions to the order n checkerboard problem up to reflection and rotation: place n pieces on an n X n board so there is exactly one piece in each row, column and main diagonal.at n=9A064280
• Numbers k such that A206369(k) = A206369(k + 1).at n=34A206368
• The number of P-positions in the game of Nim with up to 4 piles, allowing for piles of zero, such that the number of objects in each pile does not exceed n.at n=43A241522
• Numbers k such that (17*10^k - 89)/9 is prime.at n=19A295324