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A175852
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a(n) = the highest power of 5 with n decimal digits.
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1
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5, 25, 625, 3125, 78125, 390625, 9765625, 48828125, 244140625, 6103515625, 30517578125, 762939453125, 3814697265625, 95367431640625, 476837158203125, 2384185791015625, 59604644775390625, 298023223876953125
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OFFSET
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1,1
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COMMENTS
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a(n) = 5^d(n), with
d(n) = {1, 2, 4, 5, 7, 8, 10, 11, 12, 14, 15, 17, 18, 20, 21, 22, 24, 25, 27, 28}.
If we redefine the sequence as a(n) = the highest power of 5 less than 10^n, then keyword "base" may be omitted.
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LINKS
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MATHEMATICA
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d[n_]=Floor@Log[5, 10^n]; a[n_]=5^d[n]
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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