Starting positions of strings of four 9's in the decimal expansion of Pi.

Terms

a(0) =762a(1) =763a(2) =764a(3) =17988a(4) =19437a(5) =19446a(6) =19447a(7) =22753a(8) =31900a(9) =42095a(10) =56988a(11) =56989a(12) =81293a(13) =120564a(14) =140953a(15) =161862a(16) =161863a(17) =177122a(18) =182604a(19) =191104a(20) =193034a(21) =193035a(22) =193036a(23) =204198a(24) =210140a(25) =211794a(26) =220507a(27) =220568a(28) =220569a(29) =224317