1,1

These are palprimes with curved digits, i.e., palindromic primes composed of only 0's, 3s, 6s, 8s, or 9s, and they have all been proved prime. No more terms up to 7000. Primality proof for the largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] Primality testing 10^4497*(10^7*(-1+10^4497)+6083806)+10^4497-1 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 3, base 1+sqrt(3) Running N+1 test using discriminant 3, base 3+sqrt(3) Running N+1 test using discriminant 3, base 5+sqrt(3) 10^4497*(10^7*(-1+10^4497)+6083806)+10^4497-1 is prime! (147.0046s+0.0074s)

R. Ondrejka, The Top Ten: a Catalogue of Primal Configurations.

Cf. A079652.

Sequence in context: A031445 A131547 A044085 this_sequence A044466 A022274 A118312

Adjacent sequences: A107288 A107289 A107290 this_sequence A107292 A107293 A107294

base,nonn

Jason Earls (zevi_35711(AT)yahoo.com), May 20 2005