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Search: id:A114569
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| 8, 35, 143, 575, 2303, 9215, 36863, 147455, 589823, 2359295, 9437183, 37748735, 150994943, 603979775, 2415919103, 9663676415, 38654705663, 154618822655, 618475290623, 2473901162495, 9895604649983, 39582418599935
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OFFSET
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0,1
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COMMENT
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Squares of the cotangents of the arcsins of 1/(3*2^n).
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EXAMPLE
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a(2)=143
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MATHEMATICA
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Table[(9*4^n) - 1, {n, 0, 23}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 16 2006
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CROSSREFS
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Sequence in context: A036598 A059824 A094616 this_sequence A098999 A000426 A089698
Adjacent sequences: A114566 A114567 A114568 this_sequence A114570 A114571 A114572
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KEYWORD
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easy,nonn
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AUTHOR
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Al Hakanson (hawkuu(AT)excite.com), Feb 16 2006
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EXTENSIONS
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More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 16 2006
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