a(n) is the n-digit positive number with no trailing zeros and coprime to its digital reversal R(a(n)) at which abs(R(a(n))/a(n)-Pi) is minimized.

A355623

a(n) is the n-digit positive number with no trailing zeros and coprime to its digital reversal R(a(n)) at which abs(R(a(n))/a(n)-Pi) is minimized.

Terms

    a(0) =1a(1) =29a(2) =185a(3) =1745a(4) =16825a(5) =317899a(6) =2474777a(7) =29803639a(8) =134433224a(9) =2925310919a(10) =14459352454a(11) =150413935274

External references