Search: id:A101960
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%I A101960
%S A101960 0,14,30,72,96,498,4206,5901,9567
%N A101960 Indices of primes in sequence defined by A(0) = 29, A(n) = 10*A(n-1) 
               - 41 for n > 0.
%C A101960 Numbers n such that (220*10^n + 41)/9 is prime.
%C A101960 Numbers n such that digit 2 followed by n >= 0 occurrences of digit 4 
               followed by digit 9 is prime.
%C A101960 Numbers corresponding to terms <= 498 are certified primes.
%D A101960 Klaus Brockhaus and Walter Oberschelp, Zahlenfolgen mit homogenem Ziffernkern, 
               MNU 59/8 (2006), pp. 462-467.
%H A101960 Makoto Kamada, <a href="http://homepage2.nifty.com/m_kamada/math/factorizations.htm">
               Factorizations of near-repdigit numbers</a>.
%e A101960 29 is prime, hence 0 is a term.
%o A101960 (PARI) a=29;for(n=0,1500,if(isprime(a),print1(n,","));a=10*a-41)
%o A101960 (PARI) for(n=0,1500,if(isprime((220*10^n+41)/9),print1(n,",")))
%Y A101960 Cf. A000533, A002275.
%Y A101960 a(n) = A102955(n) - 1.
%Y A101960 Sequence in context: A083540 A027575 A104776 this_sequence A075208 A015222 
               A054103
%Y A101960 Adjacent sequences: A101957 A101958 A101959 this_sequence A101961 A101962 
               A101963
%K A101960 nonn,hard,more
%O A101960 1,2
%A A101960 Klaus Brockhaus (klaus-brockhaus(AT)t-online.de) and Walter Oberschelp 
               (oberschelp(AT)informatik.rwth-aachen.de), Dec 23 2004
%E A101960 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008

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