Least k such that the first n digits of the decimal expansion of the ratio of the perimeter of a regular k-gon to its diameter match those of Pi.
A280926
Least k such that the first n digits of the decimal expansion of the ratio of the perimeter of a regular k-gon to its diameter match those of Pi.
Terms
- a(0) =5a(1) =7a(2) =29a(3) =47a(4) =119a(5) =699a(6) =1407a(7) =4911a(8) =18971a(9) =46803a(10) =119951a(11) =363209a(12) =1276197a(13) =3722389a(14) =19973297a(15) =73605289a(16) =183273481a(17) =390720475a(18) =1671075265a(19) =4541314567a(20) =22107473795a(21) =44810965685a(22) =172567099183a(23) =617945607281
External references
- oeis: A280926