document.write( "Question 1068756: Let A, B, and C represent distinct digits. A four-digit positive integer of the form ABCA has the property that the two-digit integers AB, BC, and CA are all primes. Compute the number of all such four-digit integers ABCA. \n" ); document.write( "
Algebra.Com's Answer #684012 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "All the 2 digit prime numbers are:\r\n" );
document.write( "\r\n" );
document.write( "11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,\r\n" );
document.write( "53, 59, 61, 67, 71, 73, 79, 83, 89, 97\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "All 4-digit numbers of the form ABCA, where A,B, and C are\r\n" );
document.write( "all different and AB, BC, and CA are all prime numbers are:\r\n" );
document.write( "\r\n" );
document.write( "1371, 1731, 1971, 3173, 3713, 7137, 7197, 7317, 9719,\r\n" );
document.write( "\r\n" );
document.write( "Edwin

\n" ); document.write( " \n" ); document.write( "
\n" );