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 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 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

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Last modified October 21 03:24 EDT 2019. Contains 328291 sequences. (Running on oeis4.)