Search: id:A087097
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%I A087097
%S A087097 19,29,39,49,59,69,79,89,90,91,92,93,94,95,96,97,98,99,109,209,219,309,
%T A087097 319,329,409,419,429,439,509,519,529,539,549,609,619,629,639,649,659,
%U A087097 709,719,729,739,749,759,769,809,819,829,839,849,859,869,879,901,902,903,
               904,905,906,907,908,909,912,913,914,915,916,917,918,919,923,924,925,
               926,927,928,929,934,935,936,937,938,939,945,946,947,948,949,956,957,
               958,959,967,968,969,978,979,989
%N A087097 Dismal primes (cf. A087062).
%C A087097 9 is the multiplicative unit. A number n is a dismal prime if it is not 
               a dismal product (see A087062 for definition) r*s where neither r 
               nor s is 9.
%C A087097 All dismal primes must contain a 9, so this is a subset of A011539.
%C A087097 Is this the same as A088474? - Ralf Stephan, Mar 06 2004
%H A087097 D. Applegate, <a href="a087061.txt">C program for dismal arithmetic and 
               number theory</a>
%H A087097 <a href="Sindx_Di.html#dismal">Index entries for sequences related to 
               dismal arithmetic</a>
%e A087097 8 is not prime since 8 = 8*8. 9 is not prime since it is the multiplicative 
               unit. 10 is not prime since 10 = 10*8. Thus 19 is the smallest prime.
%Y A087097 Cf. A087062, A087636, A087638, A087984.
%Y A087097 Sequence in context: A047985 A061763 A088474 this_sequence A038364 A109276 
               A133765
%Y A087097 Adjacent sequences: A087094 A087095 A087096 this_sequence A087098 A087099 
               A087100
%K A087097 nonn,easy
%O A087097 1,1
%A A087097 Marc LeBrun (mlb(AT)well.com), Oct 20 2003

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