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A064809 Decimal expansion of Pi written as a sequence of natural numbers avoiding duplicates. 3
3, 1, 4, 15, 9, 2, 6, 5, 35, 8, 97, 93, 23, 84, 62, 64, 33, 83, 27, 950, 28, 841, 971, 69, 39, 937, 510, 58, 20, 974, 94, 45, 92, 30, 7, 81, 640, 628, 620, 89, 98, 6280, 34, 82, 53, 42, 11, 70, 67, 982, 14, 80, 86, 51, 32, 8230, 66, 470, 938, 44, 60, 95, 50, 582, 231, 72 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Start with the first digit of Pi and set a(1)=3. Let p(1),...,p(i), be the digits of Pi used to construct a(1),...,a(n); then a(n+1) is the smallest integer with digits p(i+1),..,p(i+j) such that a(n+1) is new and p(i+j+1) not= 0.

Is the sequence a permutation of the natural numbers?

LINKS

Paul Tek, Table of n, a(n) for n = 1..10000

EXAMPLE

Pi = 3.141592653589...

CROSSREFS

Cf. A000796.

Sequence in context: A010284 A095328 A066712 * A058361 A112668 A016734

Adjacent sequences:  A064806 A064807 A064808 * A064810 A064811 A064812

KEYWORD

base,nonn,look

AUTHOR

Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Oct 22 2001

STATUS

approved

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Last modified September 29 18:27 EDT 2020. Contains 337432 sequences. (Running on oeis4.)