Smallest number k >= 1 starting a run of n numbers i = k..k + n - 1 for which i and its digit-reverse are not coprime, while k+n and its digit-reverse are coprime.
A390629
Smallest number k >= 1 starting a run of n numbers i = k..k + n - 1 for which i and its digit-reverse are not coprime, while k+n and its digit-reverse are coprime.
Terms
- a(0) =9a(1) =8a(2) =7a(3) =6a(4) =5a(5) =4a(6) =3a(7) =2a(8) =2318a(9) =22179a(10) =22178a(11) =2153825a(12) =2153824a(13) =2153823a(14) =2153822a(15) =21234885a(16) =21234884a(17) =2548954051a(18) =2548954050a(19) =2827029885a(20) =2827029884a(21) =22196843221a(22) =22196843220a(23) =271884060481a(24) =271884060480
External references
- oeis: A390629