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A065989 The first n ternary digits of Pi expressed in decimal forms a prime. 0
2, 10, 14, 83, 669, 720, 921, 2944, 4567 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

No further terms up to 10000. - Harvey P. Dale, Oct 14 2018

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

The first 10 ternary digits of Pi (A004602) are 1001021101 = 20611 in decimal, which is a prime.

MATHEMATICA

Do[ If[ PrimeQ[ FromDigits[ First[ RealDigits[Pi, 2, n]], 2]], Print[n]], {n, 1, 5000} ]

Module[{nn=4600, pd}, pd=RealDigits[Pi, 3, nn][[1]]; Position[Table[ FromDigits[ Take[ pd, n], 3], {n, nn}], _?(PrimeQ[#]&)]]//Flatten (* Harvey P. Dale, Oct 14 2018 *)

CROSSREFS

Cf. A004602.

Sequence in context: A047043 A244268 A233454 * A299378 A031222 A272041

Adjacent sequences:  A065986 A065987 A065988 * A065990 A065991 A065992

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v, Dec 10 2001

STATUS

approved

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Last modified September 27 17:05 EDT 2021. Contains 347693 sequences. (Running on oeis4.)