Search: id:A101077
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%I A101077
%S A101077 0,6,35,98,324,1226,9260,9413
%N A101077 Indices of primes in sequence defined by A(0) = 83, A(n) = 10*A(n-1) 
               + 43 for n > 0.
%C A101077 Numbers n such that (790*10^n - 43)/9 is a prime.
%C A101077 Numbers n such that digit 8 followed by n >= 0 occurrences of digit 7 
               followed by digit 3 is prime.
%C A101077 Numbers corresponding to terms <= 324 are certified primes.
%D A101077 Klaus Brockhaus and Walter Oberschelp, Zahlenfolgen mit homogenem Ziffernkern, 
               MNU 59/8 (2006), pp. 462-467.
%H A101077 Makoto Kamada, <a href="http://homepage2.nifty.com/m_kamada/math/factorizations.htm">
               Factorizations of near-repdigit numbers</a>.
%e A101077 87777773 is prime, hence 6 is a term.
%o A101077 (PARI) a=83;for(n=0,1500,if(isprime(a),print1(n,","));a=10*a+43)
%o A101077 (PARI) for(n=0,1500,if(isprime((790*10^n-43)/9),print1(n,",")))
%Y A101077 Cf. A000533, A002275.
%Y A101077 a(n) = A103090(n) - 1.
%Y A101077 Sequence in context: A046025 A009583 A033578 this_sequence A094952 A024526 
               A089581
%Y A101077 Adjacent sequences: A101074 A101075 A101076 this_sequence A101078 A101079 
               A101080
%K A101077 nonn,hard,more
%O A101077 1,2
%A A101077 Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) and Walter Oberschelp 
               (oberschelp(AT)informatik.rwth-aachen.de), Nov 30 2004
%E A101077 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 01 2008

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