A292333 Numbers k such that k^2 divides 8^k + 1.
1, 3, 9, 57, 171, 32547, 97641, 784899, 9961491, 14913081, 24738057, 29884473, 250537059, 297381939, 892145817, 1338104811, 4014314433, 5688011361, 8515369251, 8920514307, 9146532873, 14125430547, 17064034083, 26761542921, 27439598619, 143056660689, 243640690617, 730922071851, 2157430689027, 2606254774803, 4323297055491, 5222670270483
Offset: 1