Consider numbers of the form ...19753197531975319, whose digits read from the right are 9,1,3,5,7,9,1,3,5,7,9,1,... Sequence gives lengths of these numbers that are primes.
A090746
Consider numbers of the form ...19753197531975319, whose digits read from the right are 9,1,3,5,7,9,1,3,5,7,9,1,... Sequence gives lengths of these numbers that are primes.
Terms
- a(0) =2a(1) =8a(2) =11a(3) =21a(4) =54a(5) =734a(6) =5636a(7) =14954
External references
- oeis: A090746