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
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