A166503 - OEIS

%I #8 Mar 16 2020 05:08:19

%S 5,15,17,19,23,27,49,51,53,69,73,77,85,87,107,109,115,123,141,147,151,

%T 153,157,159,163,165,171,173,177,181,187,191,199,219,229,231,233,235,

%U 239,241,243,267,269,277,279,281,289,299,319,327,331,335,337,343,357

%N Numbers k with property that k^2 is the concatenation of two or more prime numbers.

%C Only odd numbers are eligible.

%H Jinyuan Wang, <a href="/A166503/b166503.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = sqrt(A038692(n)).

%o (PARI) for(n=1, 9999, is_A152242(n^2) & print1(n, ", ")) \\ _M. F. Hasler_, Oct 15 2009

%Y Cf. A019549, A038692, A105184, A129800.

%K nonn,base

%O 1,1

%A _Zak Seidov_, Oct 15 2009

%E Terms updated according to stricter definition of A152242 by _M. F. Hasler_, Oct 15 2009