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Search: id:A155953
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| A155953 |
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Emirps of form n^2 + n + 41. |
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+0
1
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| 71, 97, 113, 347, 743, 971, 1033, 1097, 1231, 1301, 1523, 1601, 1847, 1933, 3011, 3121, 3347, 3463, 7523, 9161, 9547, 9941, 10343, 12697, 13151, 15541, 15791, 17863, 30491, 31193, 32261, 32983, 39047, 70001, 72671, 74843, 75941, 77047, 79847
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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A005846 INTERSECTION A006567.
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MAPLE
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read("transforms") ; isA006567 := proc(n) local dr ; dr := digrev(n) ; RETURN(dr <> n and isprime(dr)) ; end: for n from 1 to 800 do p := n^2+n+41; if isprime(p) then if isA006567(p) then printf("%d, ", p) ; fi; fi; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 06 2009]
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CROSSREFS
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Cf. A005846, A006567, A155924.
Sequence in context: A134936 A118217 A023282 this_sequence A166252 A166576 A142111
Adjacent sequences: A155950 A155951 A155952 this_sequence A155954 A155955 A155956
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Jan 31 2009
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl) and Dmitry Kamenetsky (dkamen(AT)rsise.anu.edu.au), Feb 06 2009
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