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A065575 The first n septenary digits found in decimal expansion of pi form a prime. 0
1, 15, 31, 575, 736, 1733, 2282 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

MATHEMATICA

p = First[ RealDigits[ Pi, 10, 10^5]]; p = p[[ Select[ Range[10^5], p[[ # ]] == 0 || p[[ # ]] == 1 || p[[ # ]] == 2 || p[[ # ]] == 3 || p[[ # ]] == 4 || p[[ # ]] == 5 || p[[ # ]] == 6 & ]]]; Do[ If[ PrimeQ[ FromDigits[ Take[p, n], 7]], Print[n]], {n, 1, 2500} ]

CROSSREFS

Sequence in context: A041444 A041446 A042853 * A041448 A157767 A146889

Adjacent sequences:  A065572 A065573 A065574 * A065576 A065577 A065578

KEYWORD

nonn,base

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 01 2001

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.