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A065576
Numbers k such that the first k nonary digits found in decimal expansion of Pi form a prime.
0
1, 447, 562, 1686
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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[[ # ]] != 9 & ]]]; Do[ If[ PrimeQ[ FromDigits[ Take[p, n], 9]], Print[n]], {n, 2250} ]
CROSSREFS
Sequence in context:
A025346
A139230
A221506
*
A200071
A203960
A147628
Adjacent sequences:
A065573
A065574
A065575
*
A065577
A065578
A065579
KEYWORD
base
,
nonn
AUTHOR
Robert G. Wilson v
, Dec 01 2001
STATUS
approved
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Last modified April 23 10:07 EDT 2024. Contains 371905 sequences. (Running on oeis4.)