1.

13,74,290 650,...... ............​

Answer»

The following numbers are SUM of SQUARES of prime numbers. ( starting from smallest prime number )

First eight prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19

  • 2² + 3³ = 4 + 9 = 13
  • 5² + 7² = 25 + 49 = 74
  • 11² + 13² = 121 + 169 = 290
  • 17² + 19² = 289 + 361 = 650

Next two prime numbers are 23 and 29

23² + 29² = 529 + 841 = 1370

The next number in the series is 1370

13, 74, 290, 650, 1370



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