A089923 - OEIS

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A089923

Duplicate of A100003.

0

5, 17, 89, 383

(list; graph; refs; listen; history; text; internal format)

OFFSET

5,1

COMMENTS

Previous name: Largest prime in the reverse concatenation of the first n consecutive prime numbers when that concatenation is a prime.

LINKS

Table of n, a(n) for n=5..8.

EXAMPLE

53 is the reverse concatenation of the consecutive primes 3 and 5. 53 is prime.

PROG

(PARI) revprime2(n) = { y=3; forprime(x=5, n, y=concat(Str(x), Str(y)); z=eval(y); if(ispseudoprime(z), print(x", "z)) ) }

CROSSREFS

Sequence in context: A153499 A012782 A026685 * A374292 A145041 A212291

Adjacent sequences: A089920 A089921 A089922 * A089924 A089925 A089926

KEYWORD

dead

AUTHOR

Cino Hilliard, Jan 11 2004

EXTENSIONS

Edited by T. D. Noe, Oct 30 2008

STATUS

approved