id:A088041 - OEIS Search Results

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Smallest k such that k^4 - 1 is divisible by an n-th power, k > 1.

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2, 3, 3, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535, 131071, 262143, 524287, 1048575, 2097151, 4194303, 8388607, 16777215, 33554431, 67108863, 134217727, 268435455, 536870911, 1073741823, 2147483647 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n) = A088040(n)^(1/4).` `Apparently a(n) = 2^(n-2) - 1 for n>3.`
	CROSSREFS	`Cf. A088040.` `Sequence in context: A055081 A109833 A132005 this_sequence A022296 A013069 A096393` `Adjacent sequences: A088038 A088039 A088040 this_sequence A088042 A088043 A088044`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 19 2003`
	EXTENSIONS	`Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 04 2003`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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