Semiprimes in the order in which they appear in the decimal expansion of Pi.

Terms

a(0) =4a(1) =14a(2) =314a(3) =141a(4) =15a(5) =415a(6) =1415a(7) =9a(8) =159a(9) =6a(10) =26a(11) =926a(12) =5926a(13) =15926a(14) =65a(15) =265a(16) =2653a(17) =92653a(18) =592653a(19) =35a(20) =535a(21) =6535a(22) =5926535a(23) =58a(24) =358a(25) =265358a(26) =314159265358a(27) =589a(28) =3589a(29) =53589