a(n) is the smallest nonnegative integer k where exactly n pairs of positive integers (x, y) exist such that x^2 + 11*y^2 = k.

A374160

a(n) is the smallest nonnegative integer k where exactly n pairs of positive integers (x, y) exist such that x^2 + 11*y^2 = k.

Terms

    a(0) =0a(1) =12a(2) =60a(3) =180a(4) =540a(5) =1620a(6) =2700a(7) =8100a(8) =12420a(9) =20700a(10) =37260a(11) =1180980a(12) =62100a(13) =476100a(14) =335340a(15) =186300a(16) =310500a(17) =1822500a(18) =558900a(19) =53144100a(20) =931500a(21) =1676700a(22) =4284900a(23) =324860625a(24) =1925100a(25) =4657500a(26) =244462860a(27) =12854700a(28) =8383500

External references