Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+1.
A116294
Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+1.
Terms
- a(0) =3a(1) =7a(2) =78a(3) =80919a(4) =91809a(5) =326510a(6) =475025a(7) =524975a(8) =673490a(9) =4323777a(10) =4767132a(11) =5232868a(12) =5676223a(13) =4083911141a(14) =4975000250a(15) =5024999750a(16) =5916088859a(17) =9503960496a(18) =9604950396
External references
- oeis: A116294