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Search: id:A151821
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| A151821 |
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Powers of 2, omitting 2 itself. |
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+0
10
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| 1, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 67108864, 134217728, 268435456, 536870912, 1073741824, 2147483648, 4294967296, 8589934592
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OFFSET
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1,2
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COMMENT
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Different from A046055.
Main diagonal of generalized Jacobsthal numbers A084170=1,2,6,12,26,52,. [From Paul Curtz (bpcrtz(AT)free.fr), Oct 24 2009]
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FORMULA
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G.f.: x(1+2x)/(1-2x). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 17 2009]
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CROSSREFS
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Sequence in context: A085629 A046055 A020707 this_sequence A147639 A049934 A089890
Adjacent sequences: A151818 A151819 A151820 this_sequence A151822 A151823 A151824
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Jul 08 2009
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