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Elsholtz 2003 cluster primes
Elsholtz, Christian, On cluster primes. Acta Arith. 109(3) (2003), 281--284. https://doi.org/10.4064/aa109-3-6. The file's text layer carries no copyright or license line; the publisher's issue listing labels the article's download "Free download under CC-BY license", a Creative Commons Attribution license with no version or URL named (https://www.impan.pl/en/publishing-house/journals-and-series/acta-arithmetica/all/109/3, read 2026-10-02; the article's own page was not opened); the site footer "Copyright © 2026 by IMPAN. All rights reserved." speaks for the site, not the article.
Source: https://www.math.tugraz.at/~elsholtz/WWW/papers/papers.html. Digest not yet written.
Bears on. #17