Numbers k such that k * (k + 8) is the concatenation of two numbers m and m-7.

Terms

a(0) =94a(1) =461a(2) =532a(3) =714a(4) =818a(5) =994a(6) =3424a(7) =6569a(8) =9994a(9) =90903a(10) =99994a(11) =980198a(12) =999994a(13) =3636357a(14) =6363636a(15) =9999994a(16) =41176464a(17) =58823529a(18) =99999994a(19) =413533834a(20) =426573426a(21) =428571422a(22) =432620005a(23) =567379988a(24) =571428571a(25) =573426567