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A065573
Numbers k such that the first k quinary digits found in the decimal expansion of Pi form a prime.
0
1, 4, 69, 3195
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..4.
MATHEMATICA
p = First[ RealDigits[ Pi, 10, 10^5]]; p = p[[ Select[ Range[10^5], p[[ # ]] == 0 || p[[ # ]] == 1 || p[[ # ]] == 2 || p[[ # ]] == 3 || p[[ # ]] == 4 & ]]]; Do[ If[ PrimeQ[ FromDigits[ Take[p, n], 5]], Print[n]], {n, 1, 5000} ]
CROSSREFS
Sequence in context:
A134794
A248027
A093852
*
A308294
A278553
A101841
Adjacent sequences:
A065570
A065571
A065572
*
A065574
A065575
A065576
KEYWORD
nonn
,
base
AUTHOR
Robert G. Wilson v
, Dec 01 2001
STATUS
approved
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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)