The cardinal number equivalent to the sum of ten and seven; 17.
From Old English 'seofontēne', combining 'seofon' (seven) and 'tēne' (ten). This compound formation pattern is consistent across Germanic languages, reflecting ancient counting systems based on groups of ten.
Seventeen is considered an unlucky number in Italian culture but represents coming-of-age in many others. Mathematically, it's the only prime number that's the sum of four consecutive primes (2+3+5+7), making it special in number theory.
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