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Parity of the iterated triangular numbers, using "2" as a seed.

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5

0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Suggested by D. R. Hofstadter.`
	FORMULA	`a(n) = mod(T^(n)(2), 2)`
	EXAMPLE	`a(1) = mod(T(2),2) = mod(3, 2) = 1.` `a(4) = mod(T(T(T(T(2)))),2) = mod(231,2) = 1.`
	CROSSREFS	`Cf. A007501.` `Sequence in context: A108737 A165221 A093879 this_sequence A089809 A165211 A096270` `Adjacent sequences: A117869 A117870 A117871 this_sequence A117873 A117874 A117875`
	KEYWORD	`easy,nonn`
	AUTHOR	`Greg Huber (huber(AT)alum.mit.edu), May 13 2006, Feb 16 2007`
	EXTENSIONS	`More terms from Greg Huber (huber(AT)alum.mit.edu), Feb 16 2007`

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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.

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