A161182 - OEIS

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A161182

Successive differences between positions of squares in list of nonprimes.

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; refs; listen; history; internal format)

	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: A016612 A199187 A098587 * A056875 A087757 A188163` `Adjacent sequences: A161179 A161180 A161181 * 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 February 16 05:32 EST 2012. Contains 205860 sequences.