

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
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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..15.


FORMULA

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


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: A055496 A105120 A084403 * A261201 A007505 A246492
Adjacent sequences: A055008 A055009 A055010 * A055012 A055013 A055014


KEYWORD

base,easy,more,nonn


AUTHOR

Henry Bottomley, May 31 2000


STATUS

approved



