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Search: id:A109615
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| A109615 |
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Primes of the form floor((Pi/2)^n). |
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1
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OFFSET
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1,1
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COMMENT
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The given terms of the sequence correspond to n=2, 3, 7, 8, 16, 18, 20 respectively. There are no other terms for n=21..100000. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 27 2007
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EXAMPLE
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A014214(20) = floor((Pi/2)^20) = floor(8363.6825...) = 8363 and 8363 = A000040(1047), therefore 8363 is a term.
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MAPLE
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a:=proc(n) if isprime(floor(((1/2)*Pi)^n))=true then floor(((1/2)*Pi)^n) else end if end proc: seq(a(n), n=1..100); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Aug 27 2007
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CROSSREFS
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Cf. A014214, A077547.
Sequence in context: A143279 A024764 A024773 this_sequence A101001 A068887 A090708
Adjacent sequences: A109612 A109613 A109614 this_sequence A109616 A109617 A109618
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KEYWORD
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nonn,more
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 01 2005
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