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Search: id:A135518
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| A135518 |
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Generalized repunits in base 15. |
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+0
2
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| 1, 16, 241, 3616, 54241, 813616, 12204241, 183063616, 2745954241, 41189313616, 617839704241, 9267595563616, 139013933454241, 2085209001813616
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OFFSET
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1,2
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COMMENT
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Primes in this sequence are given in A006033.
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FORMULA
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a(n) = (15^n-1)/14
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EXAMPLE
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a(4) = 15^3+15^2+15^1+1 = 3375+225+15+1 = 3616
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CROSSREFS
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Cf. A000225, A003462, A002450, A003463, A003464, A023000, A023001, A002452, A016123, A016125.
Sequence in context: A063814 A058667 A005619 this_sequence A064232 A074153 A119933
Adjacent sequences: A135515 A135516 A135517 this_sequence A135519 A135520 A135521
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KEYWORD
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nonn
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AUTHOR
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Julien Peter Benney (jpbenney(AT)gmail.com), Feb 19 2008
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