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A157532
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a(1) = 2; for n > 1, a(n) = 3.
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7
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2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3
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OFFSET
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1,1
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COMMENTS
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a(n) = number of neighboring natural numbers of n (e.g., n, n-1, n+1).
Decimal expansion of Sum_{i>=0} (4/7)^i. - Bruno Berselli, Aug 23 2017
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LINKS
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FORMULA
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a(n) = 1[0]1[1]1...1[n-1]1[n]1, where [0] is zeration or successor (y[0]x = x+1), [1] addition, [2] multiplication, [3] exponentiation, [4] repeated exponentiation, etc. - Natan Arie Consigli, May 02 2015
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EXAMPLE
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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