Search: id:A074822
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%I A074822
%S A074822 19,79,109,229,349,379,439,499,739,769,859,1009,1279,1429,1489,1549,
%T A074822 1579,1609,1999,2239,2269,2389,2539,2659,2689,2749,3019,3079,3319,3529,
%U A074822 3919,4129,4519,4639,4729,4789,4969,4999,5479,5569,5689,5779,5839,6199
%N A074822 Primes p(n) such that p(n) + 4 = p(n+1) and p(n) == 9 (mod 10).
%C A074822 Also primes for which k is equal to 5 in A117078. Examples: prime(9) 
               = prime(8) + (prime(8) mod 5) = 19 + (19 mod 5)=23; prime(23) = prime(22) 
               + (prime(22) mod 5) = 79 + (79 mod 5)=83; prime(1359) = prime(1358) 
               + (prime(1358) mod 5) = 11239+ (11239 mod 5)=11243 - Remi Eismann 
               (reismann(AT)free.fr), May 14 2006
%C A074822 The prime numbers in this sequence are of the form (10i-1) with i=(level(n)+1)/
               2, level(n) defined in A117563. - Remi Eismann (reismann(AT)free.fr), 
               May 14 2006, May 04 2007
%C A074822 Consider A117078: a(n) = smallest k such that prime(n+1) = prime(n) + 
               (prime(n) mod k), or 0 if no such k exists. Sequence gives values 
               of prime(n) for which k=5. - Remi Eismann (reismann(AT)free.fr), 
               May 14 2006
%H A074822 Remi Eismann, <a href="b074822.txt">Table of n, a(n) for n = 1..10000</
               a>
%t A074822 Prime[ Select[ Range[1000], Prime[ # ] + 4 == Prime[ # + 1] && Mod[ Prime[ 
               # ], 10] == 9 & ]]
%Y A074822 Cf. A117078, A074822, A001223, A117563, A001359, A118359, A118922, A118924, 
               A119504.
%Y A074822 Sequence in context: A098467 A041700 A132234 this_sequence A139871 A142789 
               A158491
%Y A074822 Adjacent sequences: A074819 A074820 A074821 this_sequence A074823 A074824 
               A074825
%K A074822 nonn
%O A074822 1,1
%A A074822 Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Sep 30 2002
%E A074822 Edited by Robert G. Wilson v (rgwv(AT)rgwv.com) and N. J. A. Sloane (njas(AT)research.att.com), 
               Oct 03 2002
%E A074822 Entry revised by N. J. A. Sloane (njas(AT)research.att.com), Feb 24 2007

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