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Search: id:A083811
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| A083811 |
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Numbers n such that 2n+1 is the digit reversal of n+1. |
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+0
6
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| 36, 396, 3996, 39996, 399996, 3999996, 39999996, 399999996, 3999999996, 39999999996, 399999999996, 3999999999996
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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1. a(n) = 36 + 360 + 3600+ ...+ up to n terms. a(n) = sum of n terms of the geometric progression with the first term 36 and common ratio 10. 2. a(n) = 36*A000042(n).( the unary sequence).
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FORMULA
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a(n) = 4*(10^n - 1).
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EXAMPLE
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36 + 1 = 37, 2*36 + 1 = 73.
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CROSSREFS
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Cf. A000042.
Adjacent sequences: A083808 A083809 A083810 this_sequence A083812 A083813 A083814
Sequence in context: A135828 A034686 A095682 this_sequence A086575 A055862 A105095
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), May 08 2003
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