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Search: id:A039954
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| A039954 |
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Palindromic primes formed from the reflected decimal expansion of Pi. |
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+0
7
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| 3, 313, 31415926535897932384626433833462648323979853562951413
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Thomas Spahni reports that the fifth member of this sequence with 921 digits is prime. He used Francois Morain's ECPP-V6.4.5a which proved primality in 14913.7 seconds running on a Celeron Core2 CPU at 2.00GHz. Jun 05 2008.
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LINKS
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Source
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
C. K. Caldwell, Prime Curios, 31414...51413 (53-digits)
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CROSSREFS
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Cf. A002385.
Cf. A002385, A119351.
Sequence in context: A083974 A135698 A088102 this_sequence A134215 A034994 A139541
Adjacent sequences: A039951 A039952 A039953 this_sequence A039955 A039956 A039957
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KEYWORD
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base,nonn,bref
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AUTHOR
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G. L. Honaker, Jr. (honak3r(AT)gmail.com)
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EXTENSIONS
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Carlos B. Rivera (crivera(AT)primepuzzles.net) reports that the next two members of this sequence have 301 and 921 digits. The first has been tested with APRTE-CLE. The second one is only a StrongPseudoPrime at the moment.
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