A100447 - OEIS

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A100447

Bisection of A000031.

2, 4, 8, 20, 60, 188, 632, 2192, 7712, 27596, 99880, 364724, 1342184, 4971068, 18512792, 69273668, 260301176, 981706832, 3714566312, 14096303344, 53634713552, 204560302844, 781874936816, 2994414645860, 11488774559636 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	MAPLE	`with(numtheory):seq((1/(2n+1))add(phi(d)2^((2n+1)/d), d=divisors(2*n+1)), n=0..30); (C. Ronaldo)`
	CROSSREFS	`Cf. A000031, A100446. Equals 2A026119.` `Sequence in context: A113180 A000116 A006407 A112278 A059731 A001315` `Adjacent sequences: A100444 A100445 A100446 * A100448 A100449 A100450`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Nov 21 2004`
	EXTENSIONS	`More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 19 2005`

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Last modified February 13 21:09 EST 2012. Contains 205561 sequences.