Search: id:A101527
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%I A101527
%S A101527 0,1,6,18,24,36,48,132,612,1339,2035,2490
%N A101527 Indices of primes in sequence defined by A(0) = 61, A(n) = 10*A(n-1) 
               + 31 for n > 0.
%C A101527 Numbers n such that (580*10^n - 31)/9 is prime.
%C A101527 Numbers n such that digit 6 followed by n >= 0 occurrences of digit 4 
               followed by digit 1 is prime.
%C A101527 Numbers corresponding to terms <= 612 are certified primes.
%D A101527 Klaus Brockhaus and Walter Oberschelp, Zahlenfolgen mit homogenem Ziffernkern, 
               MNU 59/8 (2006), pp. 462-467.
%e A101527 641 is prime, hence 1 is a term.
%o A101527 (PARI) a=61;for(n=0,1500,if(isprime(a),print1(n,","));a=10*a+31)
%o A101527 (PARI) for(n=0,1500,if(isprime((580*10^n-31)/9),print1(n,",")))
%Y A101527 Cf. A000533, A002275.
%Y A101527 a(n) = A103034(n) - 1.
%Y A101527 Sequence in context: A081318 A011775 A015707 this_sequence A028887 A051395 
               A028558
%Y A101527 Adjacent sequences: A101524 A101525 A101526 this_sequence A101528 A101529 
               A101530
%K A101527 nonn,hard,more
%O A101527 1,3
%A A101527 Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) and Walter Oberschelp 
               (oberschelp(AT)informatik.rwth-aachen.de), Dec 06 2004
%E A101527 2 more terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Dec 22 2007

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