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A244064 Primes which are concatenation of prime(n), prime(10n) and prime(100n). 1
4173310657, 97158322307, 137221330559, 223341346447, 251390752919, 271423157191, 367552173973, 433647386371, 487729796581, 491741197813, 5097643101281, 6018831116447, 6179109119983, 6439439124577, 70910343136379, 71910459137477, 82311933155327, 82912109157739 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

K. D. Bajpai, Table of n, a(n) for n = 1..11139

EXAMPLE

4173310657 is in the sequence because concatenation of [prime(13), prime(130), prime(1300)] = 4173310657, which is a prime.

97158322307 is in the sequence because concatenation of [prime(25), prime(250), prime(2500)] = 97158322307, which is a prime.

MAPLE

with(numtheory): with(StringTools): A244064:= proc() local a, b, c, m; a:=ithprime(n); b:=ithprime(10*n); c:=ithprime(100*n); m:=parse(cat(a, b, c)); if isprime(m) then RETURN (m); fi; end: seq(A244064 (), n=1..300);

MATHEMATICA

A244064 = {}; Do[t = FromDigits[Flatten[IntegerDigits /@ {Prime[n], Prime[10 n], Prime[100 n]}]]; If[PrimeQ[t], AppendTo[A244064, t]], {n, 300}]; A244064

CROSSREFS

Cf. A000040, A030469.

Cf. A031343 (prime(10n)), A031921 (prime(100n)).

Sequence in context: A038831 A038820 A198161 * A255344 A186590 A186599

Adjacent sequences:  A244061 A244062 A244063 * A244065 A244066 A244067

KEYWORD

nonn,base

AUTHOR

K. D. Bajpai, Jun 19 2014

STATUS

approved

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Last modified January 17 15:12 EST 2020. Contains 330958 sequences. (Running on oeis4.)