A126556 Arithmetic mean of two consecutive prime interprimes of second order: interprimes of third order.

734, 2825, 5957, 10305, 13932, 15830, 18825, 25084, 30205, 32121, 34901, 40640, 47984, 70842, 102897, 120165, 125973, 130250, 138924, 145480, 148894, 154236, 161676, 167730, 174737, 180632, 183077, 191253, 210375, 224327, 232817, 246285

Offset

1,1

Comments

For primes in this sequence (prime interprimes of third order) see A126557.

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Formula

a(n) = (A126555(n)+A126555(n+1))/2.

Prog

(PARI) {m=250000; a=0; g=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, print1(h=(g+b)/2, ", ")); 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).

Sequence in context: A118055 A025356 A025348 * A349870 A174456 A306474

Adjacent sequences: A126553 A126554 A126555 * A126557 A126558 A126559

Keyword

nonn

Author

Artur Jasinski, Dec 27 2006

Extensions

Edited by Klaus Brockhaus, Jan 11 2007

Status

approved