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Search: id:A141544
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| A141544 |
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Odd numbers n such that 2n+5 is a prime. |
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+0
1
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| 1, 3, 7, 9, 13, 19, 21, 27, 31, 33, 37, 39, 49, 51, 61, 63, 67, 73, 79, 81, 87, 93, 97, 103, 109, 111, 117, 123, 129, 133, 139, 151, 153, 163, 171, 177, 181, 187, 189, 207, 213, 217, 219, 229, 231, 237, 241, 243, 247, 249, 259, 271, 279, 283, 291, 297, 301, 307
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Superset of A107771. The corresponding primes are given by deleting the first entry in A002145. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 18 2008]
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FORMULA
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A089038 INTERSECT A005408. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 18 2008]
A141544(n) = A087915(n+1) - 1 = A090670(n+1) - 4. [From Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Sep 07 2008]
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MAPLE
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a:=proc(n) if isprime(2*n+5)=true then n else end if end proc: seq(a(2*n-1), n=1..170); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 17 2008]
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CROSSREFS
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Cf. A020498, A089038.
Sequence in context: A089556 A111223 A066207 this_sequence A088649 A020498 A107771
Adjacent sequences: A141541 A141542 A141543 this_sequence A141545 A141546 A141547
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KEYWORD
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nonn
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AUTHOR
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Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Aug 16 2008
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EXTENSIONS
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Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 17 2008 and R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 18 2008
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