Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate

1,2

Terms were computed by Ed Pegg Jr; see link for related Mathematica code.

Table of n, a(n) for n=1..37.

Ed Pegg Jr., The Moebius Function.

a(5) = 153 = 2^2 + 6^2 + 7^2 + 8^2 = sum of squares of primitive roots of prime(5)(=11).

For the first 10 primes the primitive roots are as follows:

{{1}, {2}, {2, 3}, {3, 5}, {2, 6, 7, 8}, {2, 6, 7, 11}, {3, 5, 6, 7, 10, 11, 12, 14}, {2, 3, 10, 13, 14, 15}, {5, 7, 10, 11, 14, 15, 17, 19, 20, 21}, {2, 3, 8, 10, 11, 14, 15, 18, 19, 21, 26, 27}}.

Sequence in context: A212149 A208740 A127981 * A057159 A189588 A266357

Adjacent sequences: A089450 A089451 A089452 * A089454 A089455 A089456

nonn

Paul D. Hanna, Nov 03 2003

approved