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A084671 Primes such that concatenation of prime[n] and n is prime. +0
1
5, 23, 67, 73, 157, 307, 389, 419, 449, 587, 661, 751, 1051, 1229, 1297, 1303, 1327, 1823, 1913, 1999, 2131, 2179, 2207, 2239, 2371, 2689, 2699, 3067, 3433, 3593, 3623, 3719, 3919, 3943, 4001, 4073, 4229, 4241, 4397, 4591, 4733, 4919, 4957, 4987 (list; graph; listen)
OFFSET

1,1

EXAMPLE

23 is a term because 23=prime[9] and concatenation of 23 and 9 is prime

CROSSREFS

Sequence in context: A089137 A098498 A106956 this_sequence A064395 A138905 A125955

Adjacent sequences: A084668 A084669 A084670 this_sequence A084672 A084673 A084674

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Jun 29 2003

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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