login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A216133 In the decimal expansion of Pi, the first occurrence of these primes begins at a prime position. 0
7, 19, 31, 41, 43, 79, 89, 107, 137, 157, 197, 233, 263, 271, 293, 317, 367, 379, 433, 449, 479, 491, 499, 601, 641, 653, 673, 751, 757, 761, 769, 787, 797, 821, 823, 827, 853, 887 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

We label the positions in 3.14159... so that 1 is in position 1, 4 in position 2, 1 in position 3, 5 in position 4, and so on.

LINKS

Table of n, a(n) for n=1..38.

EXAMPLE

The first 19 in the decimal expansion of Pi (see A000796) starts in position 37, which is a prime.

MATHEMATICA

pos_in_Pi={1, 6, 9, 2, 4, 7, 13, 11, 5, 49, 94, 148, 110, 1, 3, ....};

s={}; Do[If[PrimeQ[x]&&PrimeQ[pos_in_Pi[[x]]], AppendTo[s, pos_in_Pi]], {x, Length[v]}]; s

CROSSREFS

Cf. A000796.

Sequence in context: A040045 A242476 A079021 * A079740 A030549 A017605

Adjacent sequences:  A216130 A216131 A216132 * A216134 A216135 A216136

KEYWORD

nonn,base

AUTHOR

Vicente Izquierdo Gomez, Sep 01 2012

EXTENSIONS

Edited by N. J. A. Sloane, Sep 09 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 27 04:10 EDT 2021. Contains 347673 sequences. (Running on oeis4.)