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

Author

Zak Seidov, Mar 18 2007

Keywords

• nonn

Examples

			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.