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100/- points python3, mathematical solve
def triangular(n): return (n)*(n+1)//2 def pentagonal(n): return n*(3*n-1)//2 def hexagonal(n): return n*(2*n-1) def lint(n): if int(n)==n: return int(n) else: return int(n)+1 triangulars=set() pentagonals=set() hexagonals=set() item=input().split() n=int(item[0]) a=int(item[1]) i=1 if a==3: for i in range(1,lint((-1+(8*n)**0.5)/2)): y=(1+12*(i)*(i+1))**0.5 if int(y)==y: if (1+int(y)) % 6 == 0: print(triangular(i)) else: for i in range(1,lint((1+(24*n)**0.5)/6)): y=(4+16*i*(3*i-1))**0.5 if int(y)==y: if (2+int(y)) % 8 == 0: print(pentagonal(i))
Project Euler #45: Triangular, pentagonal, and hexagonal
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100/- points python3, mathematical solve