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 A126558 Arithmetic mean of two consecutive prime interprimes of third order: interprimes of fourth order. 3
 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; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS For primes in this sequence (prime interprimes of fourth order) see A127364. LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 FORMULA a(n) = (A126557(n)+A126557(n+1))/2. PROG (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 CROSSREFS 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: A234034 A154531 A043592 * A339752 A216400 A014778 Adjacent sequences:  A126555 A126556 A126557 * A126559 A126560 A126561 KEYWORD nonn AUTHOR Artur Jasinski, Dec 27 2006 EXTENSIONS Edited and extended by Klaus Brockhaus, Jan 11 2007 STATUS approved

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Last modified July 31 05:19 EDT 2021. Contains 346367 sequences. (Running on oeis4.)