Odd composites k such that sigma(k) has the same powerful part as k, where sigma is the sum of divisors function.

A386425

Odd composites k such that sigma(k) has the same powerful part as k, where sigma is the sum of divisors function.

Terms

    a(0) =153a(1) =801a(2) =1773a(3) =3725a(4) =4689a(5) =4753a(6) =5013a(7) =6957a(8) =8577a(9) =8725a(10) =9549a(11) =9873a(12) =11493a(13) =13437a(14) =14409a(15) =15381a(16) =18621a(17) =19269a(18) =21213a(19) =21537a(20) =23481a(21) =25101a(22) =26073a(23) =26225a(24) =28989a(25) =29161a(26) =29313a(27) =29961a(28) =32229a(29) =33849

External references