login
This site is supported by donations to The OEIS Foundation.

 

Logo

The OEIS is looking to hire part-time people to help edit core sequences, upload scanned documents, process citations, fix broken links, etc. - Neil Sloane, njasloane@gmail.com

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A055011 a(n+1) = next smallest prime beginning with a(n) when written in binary, starting with 2. 4
2, 5, 11, 23, 47, 191, 383, 3067, 12269, 196307, 6281839, 50254717, 201018869, 804075479, 1608150959, 102921661397, 1646746582367, 13173972658937, 105391781271503, 210783562543007, 3372537000688127, 26980296005505019, 863369472176160611, 6906955777409284889 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(5)=191 because a(4)=47 which in binary is 101111, none of 1011110(94) 1011111(95) 10111100(188) 10111101(189) 10111110 (190) are prime, but 10111111(191) is.

LINKS

Table of n, a(n) for n=0..23.

FORMULA

a(n+1) = A208241(a(n)). - Reinhard Zumkeller, Feb 14 2013

MAPLE

A055011 := proc(n)

    option remember;

    if n = 0 then

        2 ;

    else

        A208241(procname(n-1)) ;

    end if;

end proc: # R. J. Mathar, May 06 2017

PROG

(Haskell)

a055011 n = a055011_list !! n

a055011_list = iterate a208241 2  -- Reinhard Zumkeller, Feb 14 2013

CROSSREFS

Cf. A048549 for base 10 analog.

A055011, A261200 and A261201 are all essentially the same sequence.

Sequence in context: A105120 A084403 A261201 * A007505 A246492 A059411

Adjacent sequences:  A055008 A055009 A055010 * A055012 A055013 A055014

KEYWORD

base,easy,nonn

AUTHOR

Henry Bottomley, May 31 2000

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 29 09:17 EDT 2017. Contains 287245 sequences.