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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
Eric Weisstein's World of Mathematics, Consecutive Number Sequences
Eric Weisstein's World of Mathematics, Integer Sequence Primes
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
Sequence in context: A241129 A289330 A282157 * A204976 A204703 A206648
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.)