A239789 Primes which are a concatenation of prime(k), prime(k+2) and prime(k+4) for some k.

172331, 233141, 717989, 137149157, 191197211, 197211227, 223229239, 229239251, 257269277, 331347353, 353367379, 359373383, 467487499, 521541557, 617631643, 619641647, 647659673, 677691709, 733743757, 787809821, 797811823, 103310491061, 106110691091, 109711091123

Offset

1,1

Links

K. D. Bajpai, Table of n, a(n) for n = 1..3738

Example

172331 is a prime and appears in the sequence because it is the concatenation of prime(7), prime(7+2) and prime(7+4).
233141 is a prime and appears in the sequence because it is the concatenation of prime(9), prime(9+2) and prime(9+4).

Maple

with(StringTools): KD := proc() local a, b, d, e; a:=ithprime(n); b:=ithprime(n+2); d:=ithprime(n+4);
e:= parse(cat(a, b, d)); if isprime(e) then RETURN (e); fi; end: seq(KD(), n=1..500);

Mathematica

Select[Table[FromDigits[Flatten[{IntegerDigits[Prime[n]], IntegerDigits[Prime[n+2]], IntegerDigits[Prime[n+4]]}]], {n, 1, 500}], PrimeQ]

Crossrefs

Cf. A000040, A030461, A030469, A030473, A086040, A086041.

Sequence in context: A049053 A242980 A221742 * A233488 A233483 A251117

Adjacent sequences: A239786 A239787 A239788 * A239790 A239791 A239792

Keyword

nonn,base

Author

K. D. Bajpai, Mar 26 2014

Status

approved