29512

Appears in sequences

• "CFK" (necklace, size, unlabeled) transform of 2,1,1,1...at n=33A032140
• a(n) = (1)*(2 + 3 + 4 + ... + n) + (1 + 2)*(3 + 4 + 5 + ... + n) + (1 + 2 + 3)*(4 + 5 + 6 + ... + n) + ... + (1 + 2 + 3 + ... + n-1)*n.at n=14A067056
• Numbers k such that sigma(k) = bigomega(k) * phi(k).at n=14A067238
• Numbers n such that sigma(n) = 6*phi(n).at n=10A104900
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 1)}.at n=9A149325
• a(n) = (prime(n))^2 - (nonprime(n))^2.at n=41A161757
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of f(i,j) = gcd(i+1, j+1) (A204030).at n=39A204111
• Natural numbers k such that k is a multiple of its number of "feasible" partitions.at n=57A254438
• Partial sums of A299255.at n=25A299261
• Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=6A317226
• Number of nX7 0..1 arrays with every element unequal to 0, 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=3A317229
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=48A317230
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 0, 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=51A317230
• Number of nonisomorphic unordered pairs of involutions on an n-set.at n=25A362649
• Number of cyclic edge cuts in the n-Moebius ladder graph.at n=4A378312
• a(n) is the number of positive integers k for which Sum_{i=1..j} (p_i+e_i) = n, where p_1^e_1*...*p_j^e_j is the prime factorization of k.at n=44A382330
• a(n) = Sum_{k=0..floor((2*n+1)/7)} binomial(2*k+1,2*n-7*k+1).at n=34A392488