%I A006601 M5420
%S A006601 242,3655,4503,5943,6853,7256,8392,9367,10983,11605,11606,12565,12855,
%T A006601 12856,12872,13255,13782,13783,14312,16133,17095,18469,19045,19142,
%U A006601 19143,19940,20165,20965,21368,21494,21495,21512,22855,23989,26885
%N A006601 Numbers n such that n, n+1, n+2 and n+3 have the same number of divisors.
%D A006601 M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, 
               National Bureau of Standards Applied Math. Series 55, 1964 (and various 
               reprintings), p. 840.
%D A006601 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 242, p. 67, Ellipses, 
               Paris 2008.
%D A006601 R. K. Guy, Unsolved Problems in Number Theory, B18.
%D A006601 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A006601 T. D. Noe, <a href="b006601.txt">Table of n, a(n) for n=1..1000</a>
%H A006601 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.nrbook.com/
               abramowitz_and_stegun/">Handbook of Mathematical Functions</a>, National 
               Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 
               [alternative scanned copy].
%Y A006601 Cf. A000005, A005237, A005238.
%Y A006601 Sequence in context: A094908 A070284 A160551 this_sequence A035748 A022153 
               A013472
%Y A006601 Adjacent sequences: A006598 A006599 A006600 this_sequence A006602 A006603 
               A006604
%K A006601 nonn,easy,nice
%O A006601 1,1
%A A006601 N. J. A. Sloane (njas(AT)research.att.com).
%E A006601 More terms from Olivier Gerard (olivier.gerard(AT)gmail.com)