1,1

43 occurs as the 7th and 10th terms in A084704: ((prime(8)+43)/2 = (19+43)/2= 31 prime and ((prime(11)+43)/2 = (31+43)/2 = 37 prime;

53 is 9th and 12th terms in A084704: ((prime(10)+53)/2 = (29+53)/2 = 41 prime and ((prime(13)+53)/2 = (41+53)/2 = 47 prime.

For primes occuring in A084704 exactly 3 and 4 times see A128654, A128655. Cf. A084704 Smallest prime p > prime(n) such that (p+prime(n))/2 is prime.

Sequence in context: A095479 A033230 A118485 this_sequence A080104 A095744 A127880

Adjacent sequences: A128650 A128651 A128652 this_sequence A128654 A128655 A128656

nonn

Zak Seidov (zakseidov(AT)gmail.com), Mar 18 2007