24528

Appears in sequences

• Numbers n such that phi(sigma(n)) = 5*phi(n).at n=8A067708
• a(n) = A000010(n) * A002088(n).at n=42A143231
• Number of n X 7 binary arrays without the pattern 0 1 diagonally, vertically or antidiagonally.at n=34A188864
• Number of ways to place n nonattacking composite pieces rook + rider[1,2] on an n X n chessboard.at n=11A189837
• Table read by rows of numbers of unordered pairs of partitions of n-element set that have Rand distance k (n>=2, 1 <= k <= n(n-1)/2).at n=45A192100
• a(n) = 14*n^2 - 4*n.at n=42A195023
• G.f. A(x) satisfies: [x^(n+1)] A(x)^n = n^2 * ( [x^(n-1)] A(x)^n ) for n>=1.at n=8A245312
• Expansion of Product_{k>=1} ((1 + x^k) * (1 + 2*x^k)).at n=23A266819
• Coefficients in q-expansion of (E_2*E_4 - E_6)/720, where E_2, E_4, E_6 are the Eisenstein series shown in A006352, A004009, A013973, respectively.at n=12A281372
• p-INVERT of (1,1,1,1,1,...), where p(S) = 1 - 6*S^2.at n=8A290999
• a(n) = 3*(3*n+1)*(9*n+8)/2.at n=24A304504
• Number of integer partitions of n with more than one non-mode.at n=38A363124
• a(n) is the least number k such that the equation phi(x) = k has exactly n solutions and the arithmetic mean of these solutions is an integer, or -1 if no such number exists.at n=16A389860