sequence: 5, 20, 100, 500, 2500, 12500, 62500, 312500, 1562500, 7812500, 39062500, 195312500, 976562500, ...

a(n) = 4*5^(n-1) for n>=2, a(1)=5, a(2)=20

What is the e.g.f?

asked by guest
on Mar 13, 2026 at 6:41 pm



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