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A007523
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Primes in A092845 (decimal expansion of Pi written backwards).
(Formerly M2966)
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4
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OFFSET
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1,1
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COMMENTS
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Next term is probably A092845(711), a 712-digit probable prime (Baillie-Pomerance-Selfridge-Wagstaff test, cf. PARI/GP documentation) beginning 2116599102453... and ending ...62648323979853562951413.
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REFERENCES
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M. Gardner, Whys and Wherefores, Univ. Chicago Press, 1989, p. 84.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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EXAMPLE
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51413 is in the list because it is prime and its decimal reversal, 31415, is the first 5 digits of Pi.
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MATHEMATICA
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Module[{nn=1000, rd}, d=RealDigits[Pi, 10, nn][[1]]; Select[Table[FromDigits[Reverse[Take[d, n]]], {n, nn}], PrimeQ]] (* Harvey P. Dale, Jul 11 2023 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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