60960

Appears in sequences

• Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (3,k)-perfect numbers.at n=28A019292
• Triangle read by rows, giving T(n,k) = number of k-member minimal ordered covers of a labeled n-set (1 <= k <= n).at n=18A049055
• a(0)=1; a(n) = Sum_{j<n, gcd(n,a(j)) = 1} a(j).at n=35A055935
• Numbers m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,23.at n=9A064248
• Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,31.at n=6A064252
• Values of m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,57.at n=13A065697
• First differences of A069474, successive differences of (n+1)^6-n^6.at n=11A069475
• Theta series of 9-dimensional odd unimodular lattice E_8 + Z.at n=11A071967
• Balanced refactorable numbers.at n=7A078543
• Numbers n such that sigma(n) = 12*phi(n).at n=9A104902
• Number of 8 X 8 pandiagonal Franklin squares with magic sum 4n.at n=5A125116
• Expansion of Product_{k>=1} ((1+x^k)/(1-x^k))^(2*k).at n=10A261386
• G.f. = Phi^5, where Phi = g.f. for A028930.at n=25A328530
• Numbers k such that A380845(k) > 3*k.at n=36A380930