%I A101129
%S A101129 0,3,5,15,21,38,102,162,239,1047,1973,2558,5879
%N A101129 Indices of primes in sequence defined by A(0) = 73, A(n) = 10*A(n-1) 
               - 27 for n > 0.
%C A101129 Numbers n such that 70*10^n + 3 is prime.
%C A101129 Numbers n such that digit 7 followed by n >= 0 occurrences of digit 0 
               followed by digit 3 is prime.
%C A101129 Numbers corresponding to terms <= 239 are certified primes.
%C A101129 Certified primality of number corresponding to term 1047 with Primo. 
               - Ryan Propper (rpropper(AT)stanford.edu), Jun 20 2005
%D A101129 Klaus Brockhaus and Walter Oberschelp, Zahlenfolgen mit homogenem Ziffernkern, 
               MNU 59/8 (2006), pp. 462-467.
%H A101129 Makoto Kamada, <a href="http://homepage2.nifty.com/m_kamada/math/factorizations.htm">
               Factorizations of near-repdigit numbers</a>.
%e A101129 7000003 is prime, hence 5 is a term.
%o A101129 (PARI) a=73;for(n=0,1500,if(isprime(a),print1(n,","));a=10*a-27)
%o A101129 (PARI) for(n=0,1500,if(isprime(70*10^n+3),print1(n,",")))
%Y A101129 Cf. A000533, A002275.
%Y A101129 a(n) = A097970(n) - 1.
%Y A101129 Sequence in context: A070079 A142717 A057742 this_sequence A128396 A155173 
               A121219
%Y A101129 Adjacent sequences: A101126 A101127 A101128 this_sequence A101130 A101131 
               A101132
%K A101129 nonn,hard,more
%O A101129 1,2
%A A101129 Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) and Walter Oberschelp 
               (oberschelp(AT)informatik.rwth-aachen.de), Dec 03 2004
%E A101129 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 01 2008