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A038840 Cubes that are concatenations of primes. 3

%I #18 Mar 02 2021 16:32:30

%S 27,343,729,1331,2197,3375,4913,5832,19683,21952,24389,29791,35937,

%T 54872,59319,91125,103823,110592,117649,148877,166375,195112,205379,

%U 226981,250047,314432,357911,389017,421875,571787,614125,681472,753571,857375,941192,1092727

%N Cubes that are concatenations of primes.

%H Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a038/A038840.java">Java program</a> (github)

%e Examples from _Sean A. Irvine_, Feb 15 2021: (Start)

%e 3^3 = 27 = (2)(7).

%e 18^3 = 5832 = (5)(83)(2).

%e 29^3 = 24389 = (2)(43)(89).

%e (End)

%o (PARI) for(n=2,1e2,if(is_A152242(n^3),print1(n^3", "))) \\ _Charles R Greathouse IV_, Jun 10 2013

%Y Cf. A038692.

%K nonn,base

%O 1,1

%A _Jeff Burch_

%E Missing a(6), a(7), a(9), a(13), a(16)-a(18), a(21), a(23) from _Charles R Greathouse IV_, Jun 10 2013

%E Missing terms inserted and more terms from _Sean A. Irvine_, Feb 15 2021

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Last modified September 2 08:40 EDT 2024. Contains 375613 sequences. (Running on oeis4.)