id:A089887 - OEIS Search Results

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Number of subsets of {1,.., n} containing no squares.

+0
5

1, 2, 4, 4, 8, 16, 32, 64, 64, 128, 256, 512, 1024, 2048, 4096, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576, 1048576, 2097152, 4194304, 8388608, 16777216, 33554432, 67108864, 134217728, 268435456 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = Product(2-A010052(k): 1<=k<=n) = A089886(n,0) = A000079(n)-A089888(n).`
	FORMULA	`a(n) = 2^(n-n^(1/2)).`
	CROSSREFS	`Cf. A089889, A089890.` `Sequence in context: A131771 A047073 A069753 this_sequence A161816 A160124 A080007` `Adjacent sequences: A089884 A089885 A089886 this_sequence A089888 A089889 A089890`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 13 2003`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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