Arithmetic series

say ~(2, 4, 6, ... 100)
# 2 4 6 8 10 ... 100

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say ~(5, 10, 15 ... 100)
# 5 10 15 20 25 ... 100

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say ~(10, 9, 8 ... 0);
# 10 9 8 7 6 5 4 3 2 1 0

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say ~(2.5, 3, 3.5 ... 6)
# 2.5 3 3.5 4 4.5 5 5.5 6