Engel expansion of 1 to the base Pi.

Terms

a(0) =4a(1) =12a(2) =72a(3) =2111a(4) =14265a(5) =70424a(6) =308832a(7) =4371476a(8) =320218450a(9) =1101000257a(10) =14020589841a(11) =102772320834a(12) =963205851651