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A084671 Primes such that the decimal concatenation of prime(n) and n is prime. 3
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; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..44.

EXAMPLE

23 is a term because 23=prime(9) and concatenation of 23 and 9 is prime

CROSSREFS

Sequence in context: A176874 A241765 A106956 * A284648 A290187 A243442

Adjacent sequences:  A084668 A084669 A084670 * A084672 A084673 A084674

KEYWORD

nonn,base

AUTHOR

Zak Seidov, Jun 29 2003

EXTENSIONS

Edited by Charles R Greathouse IV, Apr 27 2010

STATUS

approved

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Last modified October 24 00:04 EDT 2018. Contains 316541 sequences. (Running on oeis4.)