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%I #19 Jun 14 2021 02:34:36
%S 1,3,4,5,7,10,11,13,14,15,19,21,22,23,29,30,31,33,34,37,38,39,41,42,
%T 43,46,47,49,51,55,57,58,59,61,65,66,67,69,70,73,74,77,78,79,82,83,86,
%U 87,91,93,94,95,97,101,102,103,105,106,109,110,111,113,114,115
%N Numbers k such that the concatenation of the numbers 1, 2, ..., k is a product of distinct primes.
%H Patrick De Geest, <a href="http://www.worldofnumbers.com/factorlist.htm">Normal Smarandache Concatenated Numbers, Prime factors from 1 up to n</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ConsecutiveNumberSequences.html">Consecutive Number Sequences</a>
%Y Cf. A007908.
%K nonn,hard,base
%O 1,2
%A _Patrick De Geest_, Feb 15 1999
%E More terms from _Sean A. Irvine_, Jun 13 2021
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