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Search: id:A162571
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| A162571 |
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Palindromes which are sums of two consecutive primes. |
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+0
1
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| 5, 8, 222, 434, 696, 828, 2112, 2992, 4224, 4554, 6336, 8448, 8888, 20202, 21712, 21812, 22722, 23832, 25652, 25952, 26862, 27672, 29092, 29292, 41114, 42024, 42724, 43334, 43734, 44544, 47174, 47974, 60106, 61116, 62526, 62626, 63936, 64146, 64446, 64946
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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A001043 INTERSECT A002113.
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EXAMPLE
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a(3) = 222= A002113(32) = A001043(29). a(4) = 434= A002113(53) = A001043(47).
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MAPLE
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isA002113 := proc(n) dgs := convert(n, base, 10) ; for i from 1 to nops(dgs)/2 do if op(i, dgs) <> op(-i, dgs) then RETURN(false); end if; end do: true; end proc:
A001043 := proc(n) ithprime(n)+ithprime(n+1) ; end proc:
for n from 1 do ps := A001043(n) ; if isA002113(ps) then printf("%d, \n", ps) ; fi; end do: # R. J. Mathar, Aug 14 2009
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CROSSREFS
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Sequence in context: A101016 A025518 A151827 this_sequence A046490 A155214 A028934
Adjacent sequences: A162568 A162569 A162570 this_sequence A162572 A162573 A162574
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KEYWORD
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nonn,base
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AUTHOR
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Claudio L Meller (claudiomeller(AT)gmail.com), Jul 06 2009
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EXTENSIONS
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Keyword:base added by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 14 2009
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