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Links are hyperlinks to external content. OEIS sequence entries have a links field (%H lines in the internal format). The links field also contains links to B-files and index entries in the OEIS. In the editing page, whether using internal format or not, one must use HTML anchor tag syntax. In the published entry, the links will show up normally without the HTML markup.

Jose Maria Grau, Florian Luca, <a href="">Cullen numbers with the Lehmer property<a>, Mar 18, 2011.
Eric Weisstein's World of Mathematics, <a href="">Lehmer Totient Problem<a>.

Although some books are available on the Web, such as scans made into PDFs, in some cases it may be preferable to use the References field instead.

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Name · Data · Offset · Comments · References · Links · Formula · Example · Maple · Mathematica · Prog · Crossrefs · Keyword · Author · Extensions