Starting index of a string of exactly 4 consecutive equal digits in decimal expansion of Pi.

Terms

a(0) =1590a(1) =4752a(2) =4903a(3) =5242a(4) =5323a(5) =5864a(6) =7965a(7) =12487a(8) =12701a(9) =13391a(10) =16733a(11) =17989a(12) =19438a(13) =21881a(14) =22754a(15) =29505a(16) =29869a(17) =30797a(18) =31901a(19) =32428a(20) =32479a(21) =33108a(22) =33173a(23) =35458a(24) =37231a(25) =37323a(26) =40793a(27) =42096a(28) =43155a(29) =43406