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Kenneth H. Rosen, Elementary Number Theory and Its Applications, Addison-Wesley, 1984, page 426 (but beware of errors!).
Table of n, a(n) for n=1..48.
Sequence in context: A194408 A057930 A233593 * A050931 A072864 A232437
Adjacent sequences: A013648 A013649 A013650 * A013652 A013653 A013654