Search: id:A085733
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%I A085733
%S A085733 4,6,9,46,49,62,65,69,91,93,94,95,466,469,493,497,622,623,626,629,655,
%T A085733 694,695,697,698,699,913,914,917,933,934,939,943,949,951,955,958,959,
%U A085733 4661,4666,4667,4694,4699,4934,4939,4971,4979,6227,6233,6238
%N A085733 Right-truncatable semiprimes.
%C A085733 Semiprimes in which repeatedly deleting the rightmost digit gives a semiprime 
               at every step until a single digit semiprime remains.
%C A085733 The sequence is finite. According to Shyam Sunder Gupta (guptass(AT)rediffmail.com) 
               the number 95861957783594714393831931415189937897 is the largest 
               right-truncatable semiprime.
%C A085733 The total number of right-truncatable semiprimes including the single 
               digit semiprimes 4, 6 and 9 is 56076. So sequence is finite. - Shyam 
               Sunder Gupta (guptass(AT)rediffmail.com), Jan 13 2008
%D A085733 Angell, I. O. and Godwin, H. J. "On Truncatable Primes." Math. Comput. 
               31, 265-267, 1977.
%D A085733 Shyam Sunder Gupta, "Truncatable Semi-primes",Mathematical Spectrum, 
               Vol. 39,No.3(2007), pp. 109-112.
%H A085733 <a href="Sindx_Tri.html#tprime">Index entries for sequences related to 
               truncatable primes</a>
%H A085733 G. L. Honaker, Jr., <a href="http://primes.utm.edu/curios/page.php?short=46613113151331733179">
               Prime Curios!</a>
%H A085733 Shyam Sunder Gupta, <a href="http://primes.utm.edu/curios/page.php?curio_id=6861">
               The largest right-truncatable semiprime.</a> Prime Curios.
%Y A085733 Cf. A001358.
%Y A085733 Sequence in context: A085721 A081614 A107665 this_sequence A107342 A086698 
               A115666
%Y A085733 Adjacent sequences: A085730 A085731 A085732 this_sequence A085734 A085735 
               A085736
%K A085733 base,nonn
%O A085733 1,1
%A A085733 G. L. Honaker, Jr. (honak3r(AT)gmail.com), Jul 20 2003
%E A085733 More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), 
               Jul 22 2003
%E A085733 More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), Jul 22, 2003

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