a(n) is the least number of sides of a regular inscribed k-gon whose perimeter yields Pi to within 1/10^n.

A259441

a(n) is the least number of sides of a regular inscribed k-gon whose perimeter yields Pi to within 1/10^n.

Terms

    a(0) =3a(1) =8a(2) =23a(3) =72a(4) =228a(5) =719a(6) =2274a(7) =7189a(8) =22733a(9) =71887a(10) =227327a(11) =718869a(12) =2273261a(13) =7188681a(14) =22732604a(15) =71886806a(16) =227326039a(17) =718868054a(18) =2273260386a(19) =7188680533a(20) =22732603855a(21) =71886805327a(22) =227326038545a(23) =718868053265

External references