Fractional part of square root of a(n) starts with digit 4.

Terms

a(0) =2a(1) =6a(2) =12a(3) =20a(4) =30a(5) =41a(6) =42a(7) =55a(8) =56a(9) =71a(10) =72a(11) =89a(12) =90a(13) =109a(14) =110a(15) =130a(16) =131a(17) =132a(18) =154a(19) =155a(20) =156a(21) =180a(22) =181a(23) =182a(24) =208a(25) =209a(26) =210a(27) =238a(28) =239a(29) =240