Numbers n such that n'' = n'+1 where n' and n'' are respectively the first and the second arithmetic derivative of n (A003415).

A189639

Numbers n such that n'' = n'+1 where n' and n'' are respectively the first and the second arithmetic derivative of n (A003415).

Terms

    a(0) =161a(1) =209a(2) =221a(3) =1935a(4) =4265a(5) =15941a(6) =22217a(7) =24041a(8) =25637a(9) =30377a(10) =38117a(11) =39077a(12) =48617a(13) =49097a(14) =55877a(15) =68441a(16) =73817a(17) =76457a(18) =80357a(19) =88457a(20) =95237a(21) =98117a(22) =99941a(23) =105641a(24) =110057a(25) =115397a(26) =122537a(27) =130217a(28) =131141a(29) =136517

External references