Positions of the digit '4' in the decimal expansion of Pi.

Terms

a(0) =2a(1) =19a(2) =23a(3) =36a(4) =57a(5) =59a(6) =60a(7) =70a(8) =87a(9) =92a(10) =104a(11) =119a(12) =125a(13) =126a(14) =145a(15) =151a(16) =157a(17) =162a(18) =182a(19) =183a(20) =188a(21) =192a(22) =201a(23) =202a(24) =217a(25) =218a(26) =223a(27) =227a(28) =251a(29) =254