id:A155721 - OEIS Search Results

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Positions of parity change in A033035.

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4, 20, 84, 340, 1364, 5460, 21844, 87380, 349524, 1398100, 5592404, 22369620, 89478484, 357913940, 1431655764, 5726623060, 22906492244, 91625968980, 366503875924, 1466015503700, 5864062014804, 23456248059220, 93824992236884 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Numbers n such that A033035(n)=(7/8)(9^n - 1)=7A002452(n).`
	FORMULA	`a(n=1,2..)=(4/3)*(4^n-1)=A080674(n).`
	EXAMPLE	`A033035(n=1..4) all are odd, then A033035(n=5..20) all are even, then A033035(n=21..84) all are odd, then A033035(n=85..340) all are even, etc.`
	CROSSREFS	`A002452, A033035, A080674.` `Sequence in context: A099898 A003489 A167682 this_sequence A084240 A080674 A110154` `Adjacent sequences: A155718 A155719 A155720 this_sequence A155722 A155723 A155724`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Jan 25 2009`

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Last modified December 5 17:24 EST 2009. Contains 170342 sequences.

AT&T Labs Research