A065990 - OEIS

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A065990

The first n base-5 digits of Pi expressed in decimal forms a prime.

%I #2 Mar 30 2012 17:30:37

%S 1,6,102,131,230

%N The first n base-5 digits of Pi expressed in decimal forms a prime.

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

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

%Y Cf. A004604.

%K base,nonn

%O 1,2

%A _Robert G. Wilson v_, Dec 10 2001