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 A166503 Numbers k with property that k^2 is the concatenation of two or more prime numbers. 3
 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; text; internal format)
 OFFSET 1,1 COMMENTS Only odd numbers are eligible. LINKS Jinyuan Wang, Table of n, a(n) for n = 1..10000 FORMULA a(n) = sqrt(A038692(n)). PROG (PARI) for(n=1, 9999, is_A152242(n^2) & print1(n, ", ")) \\ M. F. Hasler, Oct 15 2009 CROSSREFS Cf. A019549, A038692, A105184, A129800. Sequence in context: A109161 A065908 A297124 * A231720 A134453 A370919 Adjacent sequences: A166500 A166501 A166502 * A166504 A166505 A166506 KEYWORD nonn,base AUTHOR Zak Seidov, Oct 15 2009 EXTENSIONS Terms updated according to stricter definition of A152242 by M. F. Hasler, Oct 15 2009 STATUS approved

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Last modified June 12 17:51 EDT 2024. Contains 373359 sequences. (Running on oeis4.)