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Search: id:A157711
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| A157711 |
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Primes made up of 0's and four 1's only. |
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+0
2
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| 10111, 1011001, 1100101, 10010101, 10100011, 101001001, 1000001011, 1000010101, 1010000011, 1100010001, 10000001101, 10001000011, 10001001001, 10001100001, 10100000011, 10100001001, 11000000101, 11001000001
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Subsequence of A062339 and of A020449.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
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MAPLE
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for d from 4 to 18 do for c from 0 to 2^d-1 do bdgs := convert(c, base, 2) ; if add(i, i=bdgs) = 3 then p := 10^d+add(op(i, bdgs)*10^(i-1), i=1..nops(bdgs)) ; if isprime(p) then printf("%d, ", p) ; fi; fi; od: od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 06 2009]
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CROSSREFS
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Sequence in context: A144863 A058042 A161786 this_sequence A159863 A054037 A023066
Adjacent sequences: A157708 A157709 A157710 this_sequence A157712 A157713 A157714
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KEYWORD
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nonn,base
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Mar 04 2009
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EXTENSIONS
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Extended by numerous authors, Mar 06 2009
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