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A280967 Vampire numbers (definition 1) in binary: n has a nontrivial factorization using n's bits. 3
159, 175, 287, 303, 315, 318, 319, 343, 350, 351, 375, 567, 574, 575, 591, 603, 606, 623, 627, 630, 636, 638, 679, 686, 687, 699, 700, 702, 735, 750, 763, 765, 1127, 1134, 1135, 1148, 1150, 1167, 1179, 1182, 1183, 1203, 1206, 1212, 1215, 1239, 1243, 1246, 1247, 1251, 1254, 1260, 1271, 1272 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Nontrivial means that there must be at least two factors.

LINKS

Ely Golden, Table of n, a(n) for n = 1..10000

Ely Golden, General program for generating vampire number sequences

EXAMPLE

175 is a member as 175 = 7 * 25 = 10101111_2 = 111_2 * 11001_2

5887 is a member as 5887 = 7 * 29 * 29 = 1011011111111_2 = 111_2 * 11101_2 * 11101_2

CROSSREFS

Cf. A020342

Sequence in context: A303811 A207146 A045260 * A192173 A093472 A270304

Adjacent sequences:  A280964 A280965 A280966 * A280968 A280969 A280970

KEYWORD

nonn,base

AUTHOR

Ely Golden, Jan 11 2017

STATUS

approved

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Last modified August 17 17:08 EDT 2019. Contains 326059 sequences. (Running on oeis4.)