%I #21 Sep 08 2020 02:35:32
%S 6,10,14,15,21,22,26,33,34,35,38,39,46,51,55,57,58,62,65,69,77,82,85,
%T 86,87,91,93,95,115,119,123,133,155,187,203,209,215,221,247,265,287,
%U 299,319,323,391,689,731,901
%N Allan Johnson's set of 48 squarefree numbers whose reciprocals add to 1, with the property that each number has exactly two distinct prime factors.
%D R. K. Guy, Unsolved Problems in Number Theory (UPINT), Section D11.
%H G. L. Honaker, Jr., <a href="https://primes.utm.edu/curios/page.php/1.html">Prime Curios!: 1</a>
%H Tatsuru Watanabe, <a href="https://arxiv.org/abs/2009.03275">New examples of the representation of 1 by the sum of reciprocals of semiprime numbers</a>, arXiv:2009.03275 [math.NT], 2020. Has more 48-sets and 17 47-sets.
%H <a href="/index/Ed#Egypt">Index entries for sequences related to Egyptian fractions</a>
%Y Cf. A201463, A201464, A201514.
%Y Cf. A334342 (for a set of 47 terms).
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, Dec 03 2011