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

4, 46, 469, 10469, 101469, 10141569, 101421569, 1014221569, 101421522569, 1014215225269, 101421522526339, 1014215225263349, 101421522526334359, 10142152252633435389, 101421522526334353839, 1014215225263346353839

Offset: 1

Author

N. J. A. Sloane, Nov 25 2010

Keywords

• nonn
• base
• more

Comments

Semiprime analog of A054261.

References

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

Crossrefs

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

Extensions

More terms from Sean A. Irvine, Dec 02 2010