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Search: id:A106573
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| A106573 |
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Perfect squares which are neither the sum nor the difference of two primes. |
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+0
13
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| 121, 289, 529, 625, 961, 1681, 2601, 2809, 3481, 4225, 4489, 5329, 6241, 6889, 7225, 7569, 8281, 9025, 9409, 10201, 11881, 12769, 13225, 15625, 16641, 17689, 18769, 19881, 20449, 22201, 22801, 23409, 24649, 25281, 26569, 27225, 27889, 30625
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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A106547 with 0's removed.
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EXAMPLE
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a(2)=289 because it is the second perfect square which is impossible to obtain adding a prime to - or subtracting from - another one. 64 is not in the sequence because 64=67-3, a difference of two primes.
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CROSSREFS
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Cf. A106544-A106548, A106562-A106564, A106571, A106574, A106575, A106577.
Sequence in context: A023696 A038467 A106562 this_sequence A084306 A112075 A068872
Adjacent sequences: A106570 A106571 A106572 this_sequence A106574 A106575 A106576
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KEYWORD
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easy,nonn
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AUTHOR
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Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), May 09 2005
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EXTENSIONS
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Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), May 12 2005
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