Treasure hunt

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Across
  1. 1. (4+2)²-5
  2. 2. 1,2,6,24,120,?
  3. 4. e value
  4. 6. Find the LCM of 36 and 44
  5. 7. 2+3*(4-1)
Down
  1. 1. 45²
  2. 3. The LCM of two numbers is 480 and their product is 23040. Find their HCF
  3. 5. Ramanujan number
  4. 6. pi value