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501=2+3+5+7+11+13+17+19+23+29+31+37+41+47+53+59+61
The sum of the first 18 Primes.
503.
503
503 prime number, safe prime, sum of three consecutive primes (163 + 167 + 173)
2³+3³+5³+7³ Sum of the cubes of the first four primes. Twenty second Prime in the Primes of the form n²+n+41 sequence.
504=9x8x7
Last edited by richie on 12 Jan 2008, 1:29 pm, edited 1 time in total.
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