id:A106564 - OEIS Search Results

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Perfect squares which are not the difference of two primes.

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14

25, 49, 121, 169, 289, 361, 529, 625, 729, 841, 961, 1225, 1369, 1681, 1849, 2209, 2401, 2601, 2809, 3025, 3481, 3721, 3969, 4225, 4489, 4761, 5041, 5329, 5625, 5929, 6241, 6889, 7225, 7569, 7921, 8281, 8649, 9025, 9409, 10201, 10609, 11449, 11881 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`n^2 - A106546 with 0's removed.`
	EXAMPLE	`a(2)=49 because it is the second perfect square which is impossible to obtain subtracting a prime from` `another one. 64 is not in the sequence because 64=67-3 (difference of two primes).`
	CROSSREFS	`Cf. A106544-A106548, A106562-A106563, A106571, A106573-A106575, A106577.` `Adjacent sequences: A106561 A106562 A106563 this_sequence A106565 A106566 A106567` `Sequence in context: A110484 A110013 A109861 this_sequence A104777 A131706 A110015`
	KEYWORD	`easy,nonn`
	AUTHOR	`Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), May 09 2005`
	EXTENSIONS	`Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), May 12 2005`

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Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

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