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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
OFFSET
1,1
COMMENTS
Only odd numbers are eligible.
LINKS
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
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