A182271 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A182271

Starting with 1, smallest integer not yet in the sequence such that two neighboring digits of the sequence multiply to a prime.

%I #15 Sep 14 2013 13:39:38

%S 1,2,12,13,15,17,121,3,131,5,151,7,171,21,31,51,71,212,1212,1213,1215,

%T 1217,1312,1313,1315,1317,1512,1513,1515,1517,1712,1713,1715,1717,

%U 12121,213,12131,215,12151,217,12171,312,13121,313,13131,315,13151,317,13171

%N Starting with 1, smallest integer not yet in the sequence such that two neighboring digits of the sequence multiply to a prime.

%K nonn,base

%O 1,2

%A _Eric Angelini_ and _Jim Nastos_, Apr 22 2012