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A087557 a(n) = smallest prime that is the concatenation of two numbers whose product is n. 1

%I

%S 11,0,13,41,0,23,17,0,19,101,0,43,113,0,53,0,0,29,191,0,37,211,0,83,

%T 251,0,127,47,0,103,131,0,113,0,0,0,137,0,139,401,0,67,431,0,59,223,0,

%U 163,149,0,151,521,0,227,0,0,157,229,0,601,0,0,79,641,0,223,167,0,233,107,0

%N a(n) = smallest prime that is the concatenation of two numbers whose product is n.

%C a(3k+2) = 0. - _David Wasserman_, Jun 07 2005

%e a(10) = 101, the pair of complementary factors of 10 are (1,10), (2,5) and the primes obtained are 101.

%Y Cf. A087558.

%K base,nonn

%O 2,1

%A _Amarnath Murthy_, Sep 13 2003

%E More terms from _David Wasserman_, Jun 07 2005

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Last modified February 3 09:09 EST 2023. Contains 360034 sequences. (Running on oeis4.)