A229814 Primes which are a concatenation of prime(i) and prime(prime(i)) for some i.

23, 1759, 2383, 41179, 61283, 71353, 83431, 127709, 2271433, 3372269, 3532381, 4993559, 5033593, 5714153, 7275503, 8876899, 9117109, 9377351, 9717649, 10618513, 142711909, 157913297, 166314107, 169314437, 170914591, 187116073, 187716127, 190716451, 194916901

Offset

1,1

Links

K. D. Bajpai, Table of n, a(n) for n = 1..10000

Example

a(2)=1759: prime(7)= 17 and prime(17)= 59. Concatenating 17 and 59 gives 1759 which is prime.
a(4)=41179: prime(13)= 41 and prime(41)= 179. Concatenating 41 and 179 gives 41179 which is prime.

Maple

K := proc(n) local a, b, d; a :=ithprime(n);  b:=ithprime(a); d:=parse(cat(a, b)); if isprime(d) then return (d) end if; end proc:
seq(K(n), n=1..1000);

Crossrefs

Cf. A030459, A045533.

Sequence in context: A034243 A183480 A002439 * A326365 A319508 A331340

Adjacent sequences: A229811 A229812 A229813 * A229815 A229816 A229817

Keyword

nonn,base,less

Author

K. D. Bajpai, Sep 30 2013

Status

approved