206776

Appears in sequences

• Values of n for which the concatenations 1nn1, 3nn3, 7nn7 and 9nn9 are all primes.at n=14A102504
• Discriminants of real quadratic number fields with 3-class rank 2.at n=16A269318
• Discriminants of real quadratic fields with 3-class group of type (3,3).at n=16A269319
• Discriminants of real quadratic fields with 3-class tower group <81,10>.at n=4A269320