Numbers m such that tau(m) = 2 * tau(m - 1) and simultaneously sigma(m) = 2 * sigma(m - 1), where tau(k) = A000005(k) and sigma(k) = A000203(k).

A353033

Numbers m such that tau(m) = 2 * tau(m - 1) and simultaneously sigma(m) = 2 * sigma(m - 1), where tau(k) = A000005(k) and sigma(k) = A000203(k).

Terms

    a(0) =6a(1) =47796a(2) =111684a(3) =123498a(4) =224562a(5) =228378a(6) =384858a(7) =773016a(8) =1096824a(9) =1174542a(10) =2351240a(11) =2529414a(12) =3320472a(13) =3332616a(14) =3650376a(15) =4605096a(16) =4838838a(17) =4978476a(18) =5014842a(19) =5788662a(20) =6023928a(21) =6302724a(22) =7658024a(23) =8298978a(24) =9287240a(25) =9967974a(26) =10950024a(27) =12677496a(28) =14036694a(29) =14120360

External references