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Search: id:A089923
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| A089923 |
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Largest prime in the reverse concatenation of the first n consecutive prime numbers when that concatenation is a prime. |
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1
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OFFSET
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5,1
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EXAMPLE
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53 is the reverse concatenation of the consecutive primes 3 and 5. 53 is prime.
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PROGRAM
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(PARI) revprime2(n) = { y=3; forprime(x=5, n, y=concat(Str(x), Str(y)); z=eval(y); if(ispseudoprime(z), print(x", "z)) ) }
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CROSSREFS
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Sequence in context: A153499 A012782 A026685 this_sequence A145041 A139390 A145824
Adjacent sequences: A089920 A089921 A089922 this_sequence A089924 A089925 A089926
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KEYWORD
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nonn,base
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Jan 11 2004
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EXTENSIONS
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Edited by T. D. Noe (noe(AT)sspectra.com), Oct 30 2008
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