1,1
Cf. A153166 Numbers n with property that 6n+1 is prime and uses only digits 2 and 3.
Sequence in context: A139043 A125599 A153166 * A195215 A183481 A202801
Adjacent sequences: A153165 A153166 A153167 * A153169 A153170 A153171
nonn,base
Zak Seidov (zakseidov(AT)yahoo.com), Dec 20 2008