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Search: id:A126558
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| A126558 |
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Arithmetic mean of two consecutive prime interprimes of third order: interprimes of fourth order. |
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+0
3
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| 199532, 329070, 487630, 664345, 878455, 974874, 1030434, 1183684, 1329780, 1453746, 1550775, 1568843, 1573919, 1618431, 1693333, 1829142, 2087087, 2262462, 2348799, 2438192, 2811665, 3436775, 3900917, 4270580, 4830665
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(n) = (A126557(n)+A126557(n+1))/2.
For primes in this sequence (prime interprimes of fourth order) see A127364.
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PROGRAM
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(PARI) {m=5000000; a=0; g=0; e=0; p=2; q=3; r=5; while(r<=m, if((p+r)/2==q, if(a>0, b=(a+q)/2; if(isprime(b), if(g>0, h=(g+b)/2; if(isprime(h), if(e>0, f=(e+h)/2; print1(f, ", ")); e=h)); g=b)); a=q); p=q; q=r; r=nextprime(r+1))} - Klaus Brockhaus, Jan 11 2007
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CROSSREFS
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Cf. A006562 (balanced primes), A024675 (interprimes), A126554 (interprimes of second order), A126555 (prime interprimes of second order), A126556 (interprimes of third order), A126557 (prime interprimes of third order).
Sequence in context: A035230 A099818 A043592 this_sequence A014778 A094799 A106777
Adjacent sequences: A126555 A126556 A126557 this_sequence A126559 A126560 A126561
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Dec 27 2006
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EXTENSIONS
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Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jan 11 2007
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