A084669 - OEIS

A084669

Primes which are a concatenation of prime(n) and n.

53, 239, 6719, 7321, 15737, 30763, 38977, 41981, 44987, 587107, 661121, 751133, 1051177, 1229201, 1297211, 1303213, 1327217, 1823281, 1913293, 1999303, 2131321, 2179327, 2207329, 2239333, 2371351, 2689391, 2699393, 3067439

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

a(2)=239 because prime[9]=23 and concatenation of 23 and 9 is 239 which is prime.

MATHEMATICA

Select[Table[FromDigits[Flatten[{IntegerDigits[Prime[n]], IntegerDigits[n]}]], {n, 1, 500}], PrimeQ]

PROG

(Magma) [p: n in [1..500] | IsPrime(p) where p is Seqint(Intseq(n) cat Intseq(NthPrime(n)))]; // Bruno Berselli, Sep 15 2015

CROSSREFS

Cf. A084667.

Subsequence of primes of A075110.

Sequence in context: A053652 A142316 A142026 * A256339 A142357 A142061

Adjacent sequences: A084666 A084667 A084668 * A084670 A084671 A084672

KEYWORD

nonn,base

AUTHOR

Zak Seidov, Jun 29 2003

STATUS

approved