Numbers n such that sigma(n) = reversal(n+2).

A230021

Numbers n such that sigma(n) = reversal(n+2).

Terms

    a(0) =21a(1) =291a(2) =2991a(3) =43954a(4) =211552a(5) =439954a(6) =43564354a(7) =43999954a(8) =464057476a(9) =43999999954a(10) =435600004354a(11) =439560043954a(12) =439999999954

External references