id:A137271 - OEIS Search Results

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Numbers n such that pi(n^2)=pi((n-k)^2)+n, where k=A000193(n).

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2, 5, 14, 17, 18, 43, 44, 54, 107, 121, 137, 144, 417, 424, 868, 990, 991, 1094, 2529, 2586, 2740, 2741, 2785, 2878, 2948, 3085, 3176, 3267, 3269, 3346, 7319, 7694, 7750, 7868, 7984, 8061, 8161, 8250, 8308, 8340, 21182, 22190, 22801, 23200, 57448 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`Do[k=Round[Log[n]]; If[PrimePi[n^2]==PrimePi[(n-k)^2]+n, Print[n]], {n, 1, 10^5, 1}]`
	CROSSREFS	`Cf. A000193, A000720.` `Adjacent sequences: A137268 A137269 A137270 this_sequence A137272 A137273 A137274` `Sequence in context: A016737 A120626 A046058 this_sequence A131356 A089410 A118670`
	KEYWORD	`nonn`
	AUTHOR	`Manuel Valdivia (mvaldivia(AT)ugr.es), Mar 13 2007`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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