Numbers k such that sigma(A253560(k)) / A253560(k) is equal to (sigma(k)+1) / k, where A253560(k) = k multiplied by its largest prime factor.

A387406

Numbers k such that sigma(A253560(k)) / A253560(k) is equal to (sigma(k)+1) / k, where A253560(k) = k multiplied by its largest prime factor.

Terms

    a(0) =6a(1) =18a(2) =28a(3) =54a(4) =117a(5) =162a(6) =196a(7) =486a(8) =496a(9) =775a(10) =1372a(11) =1458a(12) =1521a(13) =4374a(14) =8128a(15) =9604a(16) =13122a(17) =15376a(18) =19773a(19) =24025a(20) =39366a(21) =67228a(22) =88723a(23) =118098a(24) =257049a(25) =354294a(26) =470596a(27) =476656a(28) =744775a(29) =796797

External references