2203

2207

A Lucas number, L15 specifically. Lucas numbers are generated like fibonacci numbers but with a starting set of 1,3 instead of 1,1. L15 is the largest Lucas number that is (a) prime and (b) has a composite index. How anybody can prove that, I don't know, but it's a pretty astonishing fact.

2213

2221

2221 = 1^2 + 1^3 + 2^5 + 3^7
That is, the sum of the first four fibonacci numbers raised to the power of the first four primes.

2237

2239

2243

2251

2267

2269

2273

2281

2287

2293

2297

2309

I wonder when we'll reach 5 digits at this pace.

2311

2333

2339

2341

One of several primes built out of the first four integers. Oddly enough, you can't construct ANY primes from the first 2 integers, nor the first 3, nor the first 5 nor the first 6. Savor the moment.

2347

2351

2357

2371

2377

2381

2383

2389

2393

2399

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