Friday, February 14, 2014

1769

1769 = 29 x 61.

1769 is a semiprime of the special form: the sum of a semiprime k and the kth semiprime (A100467).

1769 is a centered tridecagonal number (A069126).

The square of 1769 is the sum of three consecutive primes (A076304).

The 1769th triangular number (1,565,565) contains only the digits 1, 5, and 6 (A119133).

1769 has two representations as a sum of two squares: 1769 = 132 + 402 = 202 + 372.

1769 is the hypotenuse of two primitive Pythagorean triples: 17692 = 6962 + 14802 = 10402 + 14312.

1769 divides 8810 - 1.


Source: On-Line Encyclopedia of Integer Sequences

No comments:

Post a Comment