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Search: id:A166503
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| A166503 |
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Numbers n with property that n^2 is the concatenation of two or more prime numbers. |
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+0
3
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| 5, 15, 17, 19, 23, 27, 49, 51, 53, 69, 73, 77, 85, 87, 107, 109, 115, 123, 141, 147, 151, 153, 157, 159, 163, 165, 171, 173, 177, 181, 187, 191, 199, 219, 229, 231, 233, 235, 239, 241, 243, 267, 269, 277, 279, 281, 289, 299, 319, 327, 331, 335, 337, 343, 357
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Only odd numbers are eligible.
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FORMULA
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a(n)=sqrt(A038692(n)).
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PROGRAM
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(PARI) for(n=1, 9999, is_A152242(n^2) & print1(n", ")) \\ [M. F. Hasler (MHasler(AT)univ-ag.fr), Oct 15 2009]
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CROSSREFS
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Cf. A038692, A019549, A105184, A129800.
Sequence in context: A101238 A109161 A065908 this_sequence A134453 A022417 A102180
Adjacent sequences: A166500 A166501 A166502 this_sequence A166504 A166505 A166506
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KEYWORD
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base,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Oct 15 2009
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EXTENSIONS
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Terms updated according to stricter definition of A152242. M. F. Hasler (MHasler(AT)univ-ag.fr), Oct 15 2009
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