Status of search for primes k.2ⁿ+1

201 < k < 299 & 500,000 < n < 1,000,000

Recently reserved ranges | Reserve or submit a range

Color legend:

completed (X)

being tested

available

k \ n x 1000

500-520

520-540

540-560

560-580

580-600

600-620

620-640

640-660

660-680

680-700

700-720

720-740

740-760

760-780

780-800

800-820

820-840

840-860

860-880

880-900

900-920

920-940

940-960

960-980

980-1000

201

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

203

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

205

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

207

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

sh

sh

X

X

sh

sh

sh

209

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

211

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

213

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

215

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

sh

sh

X

X

sh

sh

sh

217

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

219

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

re

sh

sh

sh

221

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

sh

sh

sh

223

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

225

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

dw

227

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

229

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

231

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

233

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

235

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

237

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

239

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

sh

sh

X

241

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

sh

243

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

245

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

247

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

249

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

251

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

X

253

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

X

ps

ps

ps

255

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

X

257

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

X

259

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

X

261

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

md

grid

grid

grid

grid

X

X

263

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

re

265

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

re

267

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

re

269

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

re

271

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

X

X

X

X

273

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

275

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

277

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

279

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

281

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

sh

sh

sh

sh

sh

X

283

X

X

X

X

X

X

X

X

X

X

X

X

X

X

grid

X

X

X

X

X

X

285

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

287

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

289

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

sh

sh

X

291

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

293

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

295

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

sh

sh

sh

sh

sh

re

297

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

re

299

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

re