Starting positions of strings of four 6's in the decimal expansion of Pi.

Terms

a(0) =21880a(1) =29868a(2) =32427a(3) =43523a(4) =48439a(5) =48440a(6) =59983a(7) =64870a(8) =74392a(9) =100537a(10) =102387a(11) =102388a(12) =124494a(13) =131591a(14) =140744a(15) =140745a(16) =141919a(17) =147343a(18) =151265a(19) =161077a(20) =162317a(21) =166974a(22) =180722a(23) =194824a(24) =200045a(25) =226102a(26) =250129a(27) =250130a(28) =252499a(29) =252500