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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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2
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Only odd numbers are eligible.
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FORMULA
| a(n)=sqrt(A038692(n)).
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PROG
| (PARI) for(n=1, 9999, is_A152242(n^2) & print1(n", ")) \\ [M. F. Hasler (www.univ-ag.fr/~mhasler), Oct 15 2009]
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CROSSREFS
| Cf. A038692, A019549, A105184, A129800.
Sequence in context: A101238 A109161 A065908 * A134453 A174598 A022417
Adjacent sequences: A166500 A166501 A166502 * A166504 A166505 A166506
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KEYWORD
| base,nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Oct 15 2009
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EXTENSIONS
| Terms updated according to stricter definition of A152242. M. F. Hasler (www.univ-ag.fr/~mhasler), Oct 15 2009
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