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Search: id:A089437
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| A089437 |
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Numbers n such that 4^n + 3 is prime. |
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+0
1
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| 1, 2, 3, 6, 8, 9, 14, 15, 42, 114, 195, 392, 555, 852, 1004, 1185, 2001, 2030, 2031, 2276, 8610, 8967, 10362, 11366, 15927, 16514, 17877, 19122, 19898, 27728, 29156, 61275
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Contains exactly the halved even terms of A057732. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 26 2008
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EXAMPLE
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4^15 + 3 = 1073741827 a prime number
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CROSSREFS
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Adjacent sequences: A089434 A089435 A089436 this_sequence A089438 A089439 A089440
Sequence in context: A047244 A111215 A099381 this_sequence A122479 A047403 A093193
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KEYWORD
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nonn
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AUTHOR
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Herman H. Rosenfeld (herm3(AT)pacbell.net), Dec 28 2003
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EXTENSIONS
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More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 30 2003
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 26 2008
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