A082457 - OEIS

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A082457

a(n)=GCD[1+2n, A057643(1+2n)].

1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 15, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 7, 1, 5, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 15, 1, 1, 3, 1, 5, 1, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 7, 1, 1, 15, 1, 1, 1, 1, 1, 3, 1, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,7`
	EXAMPLE	`n=22: 2n+1=45, A057643(45)=5520, a(22)=GCD[45,5520]=15 while A066715[45]=3. This and A066715 are mostly equal; deviating sites see A083344.`
	MATHEMATICA	`di[x_] := Apply[LCM, Divisors[x]+1] Table[GCD[2w+1, di[1+2w]], {w, 1, 2048}];`
	CROSSREFS	`Cf. A057643, A066715, A000203.` `Sequence in context: A030576 A101874 A066715 * A031178 A091407 A031229` `Adjacent sequences: A082454 A082455 A082456 * A082458 A082459 A082460`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Apr 25 2003`

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Last modified February 15 23:34 EST 2012. Contains 205860 sequences.