display | more...

Important events in 1619:

Births:

Deaths:

1618-1619-1620

17th century


The number 1619 is:

  • The 256th prime number
  • A safe prime—that is, it is expressible in the form 2p + 1, where p is prime (in this case, p = 809)
  • A twin prime with 1621
  • A prime whose cube is expressible as the sum of three prime squares in two ways: 16193 = 32 + 249672 + 601692 = 32 + 281632 + 587412

Log in or register to write something here or to contact authors.