A139724 Number of digits between successive occurrences of digit 6 in decimal representation of Pi.
12, 1, 18, 27, 2, 2, 6, 15, 9, 8, 0, 8, 53, 2, 15, 10, 0, 6, 6, 7, 4, 13, 3, 0, 4, 4, 7, 0, 8, 3, 18, 0, 1, 19, 14, 2, 8, 17, 0, 8, 9, 12, 15, 9, 18, 5, 5, 37, 3, 4, 1, 0, 4, 8, 19, 18, 5, 6, 6, 1, 0, 11, 8, 2, 19, 5, 9, 18, 18, 16, 10, 2, 13, 12, 42, 2, 17, 6, 14, 6, 27, 15, 5, 0, 23, 8, 2, 36, 2
Offset: 1
Programs
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Mathematica
Differences[Flatten[Position[RealDigits[\[Pi],10,1200][[1]], 6]]]-1 (* Harvey P. Dale, Apr 13 2011 *)