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Search: id:A106575
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| A106575 |
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Perfect squares which are both the sum and the difference of two primes. |
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+0
14
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| 4, 9, 16, 36, 64, 81, 100, 144, 196, 225, 256, 324, 400, 441, 484, 576, 676, 784, 900, 1024, 1089, 1156, 1296, 1444, 1600, 1764, 1936, 2116, 2304, 2500, 2704, 2916, 3136, 3364, 3600, 3844, 4096, 4356, 4624, 4900, 5184, 5476, 5776, 6084, 6400, 6724, 7056
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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A106548 with 0's removed.
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EXAMPLE
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a(7)=100 because it is the seventh perfect square which is the sum and the difference of two primes: 100=97+3
(or 89+11) and 103-3. 121 is not in the sequence because it is neither the sum nor the difference of two primes. If 169
is the sum of two primes (167+2), it is not the difference of two primes, then doesn't figure here.
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CROSSREFS
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Cf. A106544-A106548, A106562-A106564, A106571, A106573, A106574, A106577.
Adjacent sequences: A106572 A106573 A106574 this_sequence A106576 A106577 A106578
Sequence in context: A068952 A100498 A000548 this_sequence A025620 A117218 A018228
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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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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), May 12 2005
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