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%I A280967 #25 Jan 27 2017 13:25:53
%S A280967 159,175,287,303,315,318,319,343,350,351,375,567,574,575,591,603,606,
%T A280967 623,627,630,636,638,679,686,687,699,700,702,735,750,763,765,1127,
%U A280967 1134,1135,1148,1150,1167,1179,1182,1183,1203,1206,1212,1215,1239,1243,1246,1247,1251,1254,1260,1271,1272
%N A280967 Vampire numbers (definition 1) in binary: n has a nontrivial factorization using n's bits.
%C A280967 Nontrivial means that there must be at least two factors.
%H A280967 Ely Golden, <a href="/A280967/b280967.txt">Table of n, a(n) for n = 1..10000</a>
%H A280967 Ely Golden, <a href="/A280967/a280967_2.sagews.txt">General program for generating vampire number sequences</a>
%e A280967 175 is a member as 175 = 7 * 25 = 10101111_2 = 111_2 * 11001_2
%e A280967 5887 is a member as 5887 = 7 * 29 * 29 = 1011011111111_2 = 111_2 * 11101_2 * 11101_2
%Y A280967 Cf. A020342
%K A280967 nonn,base
%O A280967 1,1
%A A280967 _Ely Golden_, Jan 11 2017

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