Numbers k such that both k and k+1 are Zumkeller numbers (A083207).

Terms

a(0) =5984a(1) =7424a(2) =21735a(3) =21944a(4) =26144a(5) =27404a(6) =39375a(7) =43064a(8) =49664a(9) =56924a(10) =58695a(11) =61424a(12) =69615a(13) =70784a(14) =76544a(15) =77175a(16) =79695a(17) =81080a(18) =81675a(19) =82004a(20) =84524a(21) =84644a(22) =89775a(23) =91664a(24) =98175a(25) =103455a(26) =104895a(27) =106784a(28) =109395a(29) =111824