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A065990 The first n base-5 digits of Pi expressed in decimal forms a prime. 1
1, 6, 102, 131, 230 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

The first 6 quinary digits of Pi (A004604) are 303232 = 9817 in decimal, which is a prime.

MATHEMATICA

Do[ If[ PrimeQ[ FromDigits[ First[ RealDigits[Pi, 5, n]], 5]], Print[n]], {n, 1, 3600} ]

CROSSREFS

Cf. A004604.

Sequence in context: A266683 A196960 A218462 * A306406 A277662 A022025

Adjacent sequences:  A065987 A065988 A065989 * A065991 A065992 A065993

KEYWORD

base,nonn

AUTHOR

Robert G. Wilson v, Dec 10 2001

STATUS

approved

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Last modified March 30 12:10 EDT 2020. Contains 333125 sequences. (Running on oeis4.)