Search: id:A102023
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%I A102023
%S A102023 0,1,2,17,176,323,387,391,403,530,1082
%N A102023 Indices of primes in sequence defined by A(0) = 13, A(n) = 10*A(n-1) 
               + 33 for n > 0.
%C A102023 Numbers n such that (150*10^n - 33)/9 is prime.
%C A102023 Numbers n such that digit 1 followed by n >= 0 occurrences of digit 6 
               followed by digit 3 is prime.
%C A102023 Numbers corresponding to terms <= 530 are certified primes.
%D A102023 Klaus Brockhaus and Walter Oberschelp, Zahlenfolgen mit homogenem Ziffernkern, 
               MNU 59/8 (2006), pp. 462-467.
%e A102023 163 is prime, hence 1 is a term.
%o A102023 (PARI) a=13;for(n=0,1500,if(isprime(a),print1(n,","));a=10*a+33)
%o A102023 (PARI) for(n=0,1500,if(isprime((150*10^n-33)/9),print1(n,",")))
%Y A102023 Cf. A000533, A002275.
%Y A102023 a(n) = A102939(n) - 1.
%Y A102023 Sequence in context: A046909 A041879 A011550 this_sequence A058010 A126752 
               A004029
%Y A102023 Adjacent sequences: A102020 A102021 A102022 this_sequence A102024 A102025 
               A102026
%K A102023 nonn,hard,more
%O A102023 1,3
%A A102023 Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) and Walter Oberschelp 
               (oberschelp(AT)informatik.rwth-aachen.de), Dec 28 2004

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