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A153031 Positions of prime digits of Pi. 4
1, 5, 7, 9, 10, 11, 14, 16, 17, 18, 22, 25, 26, 28, 29, 30, 32, 34, 40, 44, 47, 48, 49, 52, 54, 57, 62, 64, 65, 67, 74, 77, 84, 87, 90, 91, 92, 94, 97, 100, 103, 110, 112, 113, 115, 116, 121, 124, 131, 132, 134, 136, 137, 138, 140, 141, 142, 143, 144, 150, 157, 159, 161 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = A073303(n) + 1. - Michel Marcus, May 29 2014
MATHEMATICA
Flatten[Position[ Map[If[PrimeQ[ # ], "*", # ] &, RealDigits[ N[Pi, 100]][[1]]], "*"]]
Select[ Range@ 166, PrimeQ[ RealDigits[Pi, 10, 166][[1, # ]]] &] (* Robert G. Wilson v, Dec 21 2008 *)
Flatten[Position[RealDigits[Pi, 10, 200][[1]], _?PrimeQ]] (* Harvey P. Dale, Mar 22 2015 *)
PROG
(PARI) \p 1000
p=Vec(Str(Pi/10)); for(n=1, #p-9, if(isprime(eval(p[n+2])), print1(n", "))) \\ Jens Kruse Andersen, Jul 23 2014
CROSSREFS
Cf. A000796.
Sequence in context: A079696 A275718 A129270 * A334303 A184110 A138892
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
More concise Mathematica coding added and sequence extended by Robert G. Wilson v, Dec 21 2008
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)