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Erdős problem 946

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There are infinitely many nn such that τ(n)=τ(n+1)τ(n) = τ(n+1). Proved in [He84]. Here τ is the divisor counting function, which is σ 0 in mathlib.

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  1. Sourceerdos-problems
  2. StatementRetained
  3. Formal5 retained
  4. Resolutionproved
  5. WorkNone recorded
  6. DecisionNone here
  7. The questionNot reached
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Where the source files it575 share a topic
Number Theory576Divisors31
Erdős problem 321accepted
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