1,1

163, 163+4 = 167, 163+16 = 179, 163+64 = 227, 163+256 = 419, 163+1024 = 1187, 163+4096 = 4259, 163+16384 = 16547, 163+65536 = 65699 are all primes; the smallest such a 9-chain of primes is {163, 167, 178, 227, 419, 1187, 4259, 16547, 65699}

Cf. A023200, A049492-A049497, A049499-A049500.

Sequence in context: A109343 A027543 A134160 this_sequence A138932 A138200 A127882

Adjacent sequences: A049495 A049496 A049497 this_sequence A049499 A049500 A049501

nonn

Labos E. (labos(AT)ana.sote.hu)