A128653 Primes occurring in A084704 exactly twice.

43, 53, 59, 79, 113, 151, 163, 167, 197, 229, 269, 313, 331, 359, 367, 397, 419, 421, 449, 541, 607, 617, 619, 683, 719, 739, 757, 857, 883, 887, 907, 911, 997, 1021, 1051, 1063, 1103, 1117, 1193, 1249, 1289, 1303, 1427, 1433, 1459, 1471, 1489, 1493, 1499

Offset

1,1

Links

Table of n, a(n) for n=1..49.

Example

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.

Crossrefs

For primes occurring 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: A162464 A255224 A161406 * A080104 A095744 A156252

Adjacent sequences: A128650 A128651 A128652 * A128654 A128655 A128656

Keyword

nonn

Author

Zak Seidov, Mar 18 2007

Status

approved