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A173716 Smallest number that contains the first n semiprimes as substrings. 0

%I

%S 4,46,469,10469,101469,10141569,101421569,1014221569,101421522569,

%T 1014215225269,101421522526339,1014215225263349,101421522526334359,

%U 10142152252633435389,101421522526334353839,1014215225263346353839

%N Smallest number that contains the first n semiprimes as substrings.

%C Semiprime analog of A054261.

%D Jonathan Vos Post, Posting to the Sequence Fans Mailing List, May 24 2010

%Y Cf. A000040, A001358, A054260, A035239, A178057, A144565, A169798.

%K nonn,base,more

%O 1,1

%A _N. J. A. Sloane_, Nov 25 2010

%E More terms from _Sean A. Irvine_, Dec 02 2010

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Last modified June 12 14:09 EDT 2021. Contains 344951 sequences. (Running on oeis4.)