The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A280967 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A280967

Vampire numbers (definition 1) in binary: n has a nontrivial factorization using n's bits.
(history; published version)

#25 by N. J. A. Sloane at Fri Jan 27 13:25:53 EST 2017

STATUS

editing

approved

#24 by N. J. A. Sloane at Fri Jan 27 13:25:33 EST 2017

LINKS

Ely Golden, <a href="/A280967/a280967_2.sagews.txt">Generalized General program for generating vampire number sequences</a>

STATUS

proposed

editing

Discussion

Fri Jan 27

13:25

N. J. A. Sloane: "General" is the word you want

#23 by Ely Golden at Fri Jan 27 01:43:41 EST 2017

STATUS

editing

proposed

Discussion

Fri Jan 27

04:25

Joerg Arndt: "Generalized program" does not sound good at all.

#22 by Ely Golden at Fri Jan 27 01:43:37 EST 2017

LINKS

Ely Golden, <a href="/A280967/a280967_12.sagews.txt">Generalized program for generating vampire number sequences</a>

STATUS

approved

editing

#21 by N. J. A. Sloane at Sat Jan 14 16:28:29 EST 2017

STATUS

proposed

approved

#20 by Ely Golden at Sat Jan 14 15:18:53 EST 2017

STATUS

editing

proposed

Discussion

Sat Jan 14

16:10

Michel Marcus: thanks

#19 by Ely Golden at Sat Jan 14 15:18:47 EST 2017

NAME

Vampire numbers (version definition 1) in binary: n has a nontrivial factorization using n's bits.

STATUS

proposed

editing

#18 by Ely Golden at Sat Jan 14 15:08:43 EST 2017

STATUS

editing

proposed

#17 by Ely Golden at Sat Jan 14 15:08:32 EST 2017

LINKS

Ely Golden, <a href="/A280967/a280967_1.sagews.txt"> Program Generalized program for generating binary vampire number (version 1) sequences </a>

#16 by Ely Golden at Sat Jan 14 14:53:41 EST 2017

EXAMPLE

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

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