id:A048640 - OEIS Search Results

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Binary encoding of A005117.

+0
4

1, 2, 4, 8, 6, 16, 10, 32, 64, 18, 12, 128, 256, 20, 34, 512, 66, 1024, 14, 2048, 36, 130, 24, 4096, 258, 68, 8192, 22, 16384, 514, 32768, 132, 65536, 40, 260, 1026, 131072, 262144, 2050, 72, 38, 524288, 516, 26, 1048576, 2097152, 4098, 48, 70, 4194304 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = 2^i1+2^i2+...+2^iz, where A005117[ n ] = p_i1p_i2p_i3...p_iz (p_i stands for the i-th prime, where the first prime is 2).`
	EXAMPLE	`10 = 25 = p_1p_3 -> 2^1+2^3 = 2+8 = 10.`
	CROSSREFS	`Cf. A048639.` `Sequence in context: A151732 A109554 A140692 this_sequence A124510 A131886 A061284` `Adjacent sequences: A048637 A048638 A048639 this_sequence A048641 A048642 A048643`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen, Jul 14 1999`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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