id:A047931 - OEIS Search Results

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Number of new penny-penny contacts when putting pennies on a table following a spiral pattern.

+0
2

0, 1, 2, 2, 2, 2, 3, 2, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 3, 2, 3, 2, 3, 3, 2, 3, 3, 2, 3, 3, 2, 3, 3, 2, 3, 3, 3, 2, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 3, 2, 3, 3, 3, 3, 2, 3, 3, 3, 3, 2, 3, 3, 3, 3, 2, 3, 3, 3, 3, 3 (list; graph; listen)

	OFFSET	`1,3`
	LINKS	`R. W. Grosse-Kunstleve, Penny Spiral Sequence`
	FORMULA	`The n-th "chunk" consists of 2 3{n-2} 2 3{n-1} 2 3{n-1} 2 3{n-1} 2 3{n-1} 2 3{n}, where a{b} symbolizes b repetitions of a.`
	CROSSREFS	`Cf. A047932.` `Sequence in context: A069719 A074592 A089993 this_sequence A033618 A061357 A138139` `Adjacent sequences: A047928 A047929 A047930 this_sequence A047932 A047933 A047934`
	KEYWORD	`nonn`
	AUTHOR	`Ralf W. Grosse-Kunstleve (rwgk(AT)cci.lbl.gov)`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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