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Search: id:A137179
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| A137179 |
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a(n) = the smallest positive integer m such that d(m) + d(m+1) = n, where d(m) is the number of positive divisors of m. (a(n) is the smallest m where A092405(m) = n.). |
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+0
1
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| 1, 2, 3, 5, 8, 11, 15, 20, 24, 39, 35, 59, 80, 84, 195, 167, 120, 119, 224, 239, 399, 335, 440, 359, 360, 480, 1520, 539, 899, 719, 1224, 720, 840, 1079, 3135, 1259, 5183, 1260, 2400, 2160, 1680, 1679, 9408, 2880, 7056, 2639, 3024, 2520, 6240, 2519, 7055, 6929
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OFFSET
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3,2
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MATHEMATICA
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a = {}; For[n = 3, n < 60, n++, i = 1; While[ ! DivisorSigma[0, i] + DivisorSigma[0, i + 1] == n, i++ ]; AppendTo[a, i]]; a - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 18 2008
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CROSSREFS
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Cf. A092405.
Sequence in context: A126097 A131073 A062485 this_sequence A096777 A125811 A071424
Adjacent sequences: A137176 A137177 A137178 this_sequence A137180 A137181 A137182
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), May 11 2008
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EXTENSIONS
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More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 18 2008
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