Numbers of the forms 4*p or q where both numbers p=(10^n-7)/3 and q=(127*10^(n-1)-7)/3 are primes.
A102589
Numbers of the forms 4*p or q where both numbers p=(10^n-7)/3 and q=(127*10^(n-1)-7)/3 are primes.
Terms
- a(0) =124a(1) =421a(2) =1324a(3) =4231a(4) =13324a(5) =42331a(6) =1333324a(7) =4233331
External references
- oeis: A102589