Composite numbers n that divide 2 * sigma(n) - d(n) [that is, 2 * sum of divisors - number of divisors].

A135470

Composite numbers n that divide 2 * sigma(n) - d(n) [that is, 2 * sum of divisors - number of divisors].

Terms

    a(0) =18a(1) =70a(2) =88a(3) =132a(4) =780a(5) =11096a(6) =17816a(7) =518656a(8) =1713592a(9) =9928792a(10) =11547352a(11) =13499120a(12) =17999992a(13) =89283592a(14) =134094848a(15) =173482552a(16) =175519344a(17) =318836720a(18) =903230984a(19) =1081850752a(20) =2146926592a(21) =16709332608a(22) =18543186000a(23) =34177937500

External references