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 A004603 Expansion of Pi in base 4. 25
 3, 0, 2, 1, 0, 0, 3, 3, 3, 1, 2, 2, 2, 2, 0, 2, 0, 2, 0, 1, 1, 2, 2, 0, 3, 0, 0, 2, 0, 3, 1, 0, 3, 0, 1, 0, 3, 0, 1, 2, 1, 2, 0, 2, 2, 0, 2, 3, 2, 0, 0, 0, 3, 1, 3, 0, 0, 1, 3, 0, 3, 1, 0, 1, 0, 2, 2, 1, 0, 0, 0, 2, 1, 0, 3, 2, 0, 0, 2, 0, 2, 0, 2, 2, 1, 2, 1, 3, 3, 0, 3, 0, 1, 3, 1, 0, 0, 0, 0, 2, 0, 0, 2, 3, 2 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Theoretically, this sequence could be used to encode a given number of digits of Pi as a DNA sequence, which could then be read back from one helix. The value read back from the other helix would of course depend on the assignment of G, A, C, T to the digits 0, 1, 2, 3. - Alonso del Arte, Nov 07 2011 LINKS G. C. Greubel, Table of n, a(n) for n = 1..10000 Francisco Javier Aragón Artacho, 100 billion step walk on the digits of pi F. J. Aragon Artacho, D. H. Bailey, J. M. Borwein, P. B. Borwein, J. Fountain, and M. Skerritt Walking on numbers: a multiple media mathematics project, 2012. Elias Bröms, Pictures of Pi FORMULA a(n) = 2*A004601(2n) + A004601(2n+1). - Jason Kimberley, Nov 08 2012 EXAMPLE 3.02100333122220202011220300203103010301... MATHEMATICA RealDigits[Pi, 4, 100][[1]] Table[ResourceFunction["NthDigit"][Pi, n, 4], {n, 1, 100}] (* Joan Ludevid, Jul 04 2022; easy to compute a(10000000)=2 with this function; requires Mathematica 12.0+ *) CROSSREFS Pi in base b: A004601 (b=2), A004602 (b=3), this sequence (b=4), A004604 (b=5), A004605 (b=6), A004606 (b=7), A006941 (b=8), A004608 (b=9), A000796 (b=10), A068436 (b=11), A068437 (b=12), A068438 (b=13), A068439 (b=14), A068440 (b=15), A062964 (b=16), A060707 (b=60). Cf. A007514. Cf. A004595, A004541. - Jason Kimberley, Dec 01 2012 Sequence in context: A124452 A351532 A291786 * A174951 A275326 A092926 Adjacent sequences: A004600 A004601 A004602 * A004604 A004605 A004606 KEYWORD nonn,base,cons,easy AUTHOR STATUS approved

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Last modified December 3 23:46 EST 2022. Contains 358544 sequences. (Running on oeis4.)