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 A176024 Numbers k such that the reverse concatenation of the first k integers (A000422(k)) is a prime. 4
 82, 37765 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(1) was pointed out by Artur Jasinski, Mar 30 2008 (see A000422). a(2) was found by Eric W. Weisstein, Apr 06 2010. a(3) > 84300. - Tyler Busby, Feb 21 2023 LINKS Table of n, a(n) for n=1..2. Eric Weisstein's World of Mathematics, Consecutive Number Sequences Eric Weisstein's World of Mathematics, Integer Sequence Primes Index entries for sequences related to Most Wanted Primes video EXAMPLE a(1) is 82 since the 155-digit number 828180...54321 is prime. a(2) is 37765 since the 177719-digit number 377653776437763...54321 is (a probable) prime. CROSSREFS Cf. A000422, A007908, A176942. Sequence in context: A241129 A289330 A282157 * A204976 A204703 A206648 Adjacent sequences: A176021 A176022 A176023 * A176025 A176026 A176027 KEYWORD nonn,hard,more,base,bref AUTHOR Eric W. Weisstein, Apr 06 2010 EXTENSIONS Edited by N. J. A. Sloane, Dec 03 2021 STATUS approved

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Last modified February 27 08:19 EST 2024. Contains 370367 sequences. (Running on oeis4.)