28210

Appears in sequences

• 144*n^2 - n.at n=13A156635
• a(n) = 576*n^2 - 2*n.at n=6A158371
• a(n) = 196*n^2 - 14.at n=11A158553
• Numbers n such that n = x + y, sigma_1(n) = sigma_1(x) + sigma_1(y) and sigma_2(n) = sigma_2(x) + sigma_2(y).at n=17A219033
• Numbers k whose sum of divisors equals the sum of divisors of 2*k-1.at n=11A289738
• Partial sums of A008137.at n=37A299276
• Squarefree numbers k such that the sum of the distinct prime factors of k is twice the difference between the largest and the smallest prime factors of k.at n=29A324210