Starting positions of strings of three 7's in the decimal expansion of Pi.

Terms

a(0) =1589a(1) =1590a(2) =4575a(3) =5241a(4) =5242a(5) =5322a(6) =5323a(7) =5355a(8) =5450a(9) =5863a(10) =5864a(11) =11298a(12) =11733a(13) =12661a(14) =14292a(15) =15501a(16) =17234a(17) =17502a(18) =18516a(19) =19903a(20) =20404a(21) =21423a(22) =21571a(23) =23538a(24) =23749a(25) =24373a(26) =25551a(27) =25788a(28) =25858a(29) =26796