1172889

Appears in sequences

• Pseudo-powers to base 3: numbers k that are not powers of 3 such that k divides 2^k + 1.at n=30A016057
• Primitive pseudo-powers to base 3.at n=7A016058
• Squares that are the concatenation of three numbers, one of which is the sum of the other two.at n=19A062555
• Square such that the next three squares also having a square digit sum.at n=14A068834
• Solutions to mod(sigma(x), 6) = 5.at n=26A074384
• Triangle read by rows: T(n,m) = Prime[m]^n*(Prime[m] - 1)/2.at n=31A121057
• a(n) = (prime(n)^5 - prime(n)^4)/2.at n=7A138439
• Squares n^2 that become prime after omitting all ones in their decimal expansion.at n=19A175983
• T(n,k)=Petersen graph (3,1) coloring a rectangular array: number of nXk 0..5 arrays where 0..5 label nodes of a graph with edges 0,1 0,3 3,5 3,4 1,2 1,4 4,5 2,0 2,5 and every array movement to a horizontal or antidiagonal neighbor moves along an edge of this graph, with the array starting at 0.at n=25A223556
• Petersen graph (3,1) coloring a rectangular array: number of 5Xn 0..5 arrays where 0..5 label nodes of a graph with edges 0,1 0,3 3,5 3,4 1,2 1,4 4,5 2,0 2,5 and every array movement to a horizontal or antidiagonal neighbor moves along an edge of this graph, with the array starting at 0.at n=2A223560
• Magic sums of 3 X 3 semimagic squares of squares whose rows, columns, and at least one of the two main diagonals sum to the same number.at n=9A271021
• Numbers n such that n^3-1 is a sum of cubes in 1 way and a difference of cubes in 2 ways.at n=26A281789
• Terms k of A006521 such that 2*k is a term of A124240.at n=39A289257
• Numbers k such that A071187(k) <> A329614(k).at n=38A329613