Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 4.

A116129

Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 4.

Terms

    a(0) =11a(1) =101a(2) =1001a(3) =10001a(4) =100001a(5) =1000001a(6) =10000001a(7) =100000001a(8) =1000000001a(9) =10000000001a(10) =13223140496a(11) =20661157025a(12) =29752066116a(13) =40495867769a(14) =52892561984a(15) =66942148761a(16) =82644628100a(17) =100000000001

External references