bibkey: dequatre2021a343502
authors: C. H. R. Dequatre
year: 2021
title: "OEIS A343502, Numbers k such that tau(tau(k)) and tau(k+1) are both prime"
doi: null
url: https://oeis.org/A343502
claim: "%C A343502 Conjecture: all members except 2 and 3 are composite."
strata_touched:
  - D5/S3/Arith/Divisors/OeisA343502DivisorCountPrimes
license: citation-only
triage: anchor

OEIS A343502

The entry is titled “Numbers k such that tau(tau(k)) and tau(k+1) are both prime, where tau is the number of divisors function.” Its comments state: “Conjecture: all members except 2 and 3 are composite.” The entry also asks whether there are finitely many odd terms.

Verified locator

• URL: https://oeis.org/A343502
• NAME (verbatim): Numbers k such that tau(tau(k)) and tau(k+1) are both prime, where tau is the number of divisors function.
• COMMENT (verbatim): Conjecture: all members except 2 and 3 are composite.
• AUTHOR (verbatim): C. H. R. Dequatre, Apr 17 2021.
• Revision: 27.