0,1

a(5) = 112573 is a concatenation of 11,2,5,7 and 3 and is the smallest such prime.

a(7) = 11131719257 = Concatenate(11,13,17,19,2,5,7); 11131719257 is prime, as are each of the 7 distinct integers concatenated.

a(8) = 111317193257 = Concatenate(11,13,17,19,3,2,5,7), and is prime.

Cf. A000040.

Sequence in context: A088087 A088085 A068983 this_sequence A083470 A064110 A126040

Adjacent sequences: A083424 A083425 A083426 this_sequence A083428 A083429 A083430

base,more,nonn

Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), Apr 29 2003

a(7), a(8) from Jonathan Vos Post (jvospost2(AT)yahoo.com), Mar 20 2006