Starting positions of strings of four 1's in the decimal expansion of Pi.

Terms

a(0) =12700a(1) =16732a(2) =32788a(3) =32789a(4) =37230a(5) =43154a(6) =48665a(7) =55716a(8) =87323a(9) =91195a(10) =92410a(11) =93535a(12) =120459a(13) =120460a(14) =123036a(15) =123954a(16) =140159a(17) =141899a(18) =141900a(19) =145690a(20) =149927a(21) =159573a(22) =172049a(23) =175018a(24) =191909a(25) =209140a(26) =215209a(27) =248918a(28) =255945a(29) =255946