A127364 Primes in A126558.

1693333, 14251277, 17306687, 18067739, 25852399, 29126567, 55781581, 62333321, 113347009, 173863769, 204308891, 211281809, 247612801, 256102939, 267030149, 267670129, 277108457, 291010691, 298502489, 337176617, 365570923, 370598051

Offset

1,1

Comments

Prime interprimes of fourth order.

Primes that are the arithmetic mean of two consecutive prime interprimes of third order; primes of the form (A126557(k)+A126557(k+1))/2.

Links

Amiram Eldar, Table of n, a(n) for n = 1..1900

Prog

(PARI) {m=400000000; 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; if(isprime(f), print1(f, ", "))); e=h)); g=b)); a=q); p=q; q=r; r=nextprime(r+1))}

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), A126558 (interprimes of fourth order).

Sequence in context: A017468 A017600 A096372 * A251851 A083600 A257432

Adjacent sequences: A127361 A127362 A127363 * A127365 A127366 A127367

Keyword

nonn

Author

Klaus Brockhaus, Jan 11 2007

Status

approved