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 A007523 Primes in A092845 (decimal expansion of Pi written backwards). (Formerly M2966) 4
 3, 13, 51413, 951413, 2951413, 53562951413, 979853562951413 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 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. a(8) = A092845(711) is now a proven prime. - Sean A. Irvine, Jan 07 2018 REFERENCES 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). LINKS Sean A. Irvine, Primo certificate for primality of a(8) FORMULA Equals A000040 intersect A092845. EXAMPLE 51413 is in the list because it is prime and its decimal reversal, 31415, is the first 5 digits of Pi. CROSSREFS Cf. A005042, A092845, A011545. Sequence in context: A320041 A016104 A112856 * A092830 A317481 A271393 Adjacent sequences:  A007520 A007521 A007522 * A007524 A007525 A007526 KEYWORD base,nonn AUTHOR EXTENSIONS Edited by M. F. Hasler and N. J. A. Sloane, Mar 30 2008 Edited by T. D. Noe, Oct 30 2008 STATUS approved

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Last modified July 19 03:54 EDT 2019. Contains 325144 sequences. (Running on oeis4.)