A121559 - OEIS

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A121559

Find r1 = n modulo p1, where p1 is the largest prime not greater than n. Then find r2 = r1 modulo p2, where p2 is the largest prime not greater than r1. Repeat until the last r is either 1 or 0; a(n) is the last r value.

1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`The sequence has the form of blocks of 0's between 1's. See sequence A121560 for the lengths of the blocks of zeros.`
	LINKS	`Kerry Mitchell, Table of n, a(n) for n = 1..7919`
	EXAMPLE	`a(9) = 0 because 7 is the largest prime not larger than 9, 9 mod 7 = 2, 2 is the largest prime not greater than 2 and 2 mod 2 = 0.`
	CROSSREFS	`Cf. A121560, A121561, A121562.` `Sequence in context: A101266 A105367 A065043 * A004641 A100810 A114591` `Adjacent sequences: A121556 A121557 A121558 * A121560 A121561 A121562`
	KEYWORD	`easy,nonn`
	AUTHOR	`Kerry Mitchell, Aug 07 2006`
	STATUS	`approved`

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Last modified May 19 06:55 EDT 2013. Contains 225429 sequences.