Numbers k such that sigma_odd(k) = sigma_odd(k+1), where sigma_odd(k) is the sum of the odd divisors of k (A000593).

A164522

Numbers k such that sigma_odd(k) = sigma_odd(k+1), where sigma_odd(k) is the sum of the odd divisors of k (A000593).

Terms

    a(0) =1a(1) =27089a(2) =115289a(3) =233729a(4) =2529090a(5) =2880989a(6) =14059709a(7) =17192909a(8) =17540250a(9) =18693990a(10) =34902630a(11) =54722249a(12) =58517910a(13) =82200689a(14) =83087730a(15) =92991990a(16) =93623250a(17) =93862230a(18) =96578369a(19) =111681990a(20) =112244369a(21) =155120129a(22) =206450369a(23) =269626769a(24) =293182469a(25) =303206310a(26) =324764910

External references