id:A161182 - OEIS Search Results

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Successive differences between positions of squares in list of nonprimes.

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1, 1, 3, 5, 6, 9, 9, 12, 13, 16, 16, 19, 20, 22, 25, 25, 26, 30, 31, 33, 34, 36, 38, 41, 40, 43, 46, 47, 48, 51, 53, 53, 56, 57, 60, 61, 64, 66, 65, 68, 69, 72, 76, 75, 78, 78, 83, 82, 82, 89, 90, 88, 89, 95, 96, 100, 101, 98, 104, 103, 105, 110, 108, 112, 115, 115, 118, 120 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n)=A078435(n)-A078435(n-1). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 22 2009]`
	MAPLE	`A038107 := proc(n) numtheory[pi]( n^2) ; end: A078435 := proc(n) n^2-A038107(n) ; end: A161182 := proc(n) A078435(n)-A078435(n-1) ; end: seq(A161182(n), n=1..100) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 22 2009]`
	CROSSREFS	`Cf. A078435, sequence of positions of squares in sequence of nonprimes.` `Sequence in context: A152989 A016612 A098587 this_sequence A056875 A087757 A088359` `Adjacent sequences: A161179 A161180 A161181 this_sequence A161183 A161184 A161185`
	KEYWORD	`nonn`
	AUTHOR	`Daniel Tisdale (daniel6874(AT)gmail.com), Jun 05 2009`
	EXTENSIONS	`Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 22 2009`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

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