a(n) = Number of x <= 10^n such that 2x^2-1 is prime.
A143835
a(n) = Number of x <= 10^n such that 2x^2-1 is prime.
Terms
- a(0) =7a(1) =45a(2) =303a(3) =2202a(4) =17185a(5) =141444a(6) =1200975a(7) =10448345a(8) =92435171a(9) =828797351a(10) =7511268020a(11) =68680339342
External references
- oeis: A143835