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  1. a_1 = 3
  2. a_N = 495
  3. r = 6
  4.  
  5. N = (a_N - a_1)/r + 1
  6. S = N/2 * (a_1 + a_N)
  7.  
  8. print(S)
Success #stdin #stdout 0.02s 27696KB
comments (?)
stdin 
Standard input is empty
stdout 
20667.0
https://ideone.com/7i5jTm
language:
Python 3 (python  3.9.5)
created:
7 years ago
visibility:
secret

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