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A057791 Sum[k^(n-k)], where sum is over positive integers, k, where k <= n and gcd(k,n) = 1. 0
1, 1, 3, 4, 22, 6, 209, 376, 1835, 2540, 49863, 94944, 1151914, 2190666, 12079274, 95722288, 1150653920, 3217888350, 47454745803, 130819911320, 846278385786, 8064305838350, 126356632390297, 288019285668096, 6861189820377586 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

a(8) = 1^7 + 3^5 + 5^3 + 7^1 = 376, since 1, 3, 5 and 7 are the positive integers relatively prime to 8 and <= 8.

CROSSREFS

Sequence in context: A012123 A012255 A012247 * A167452 A316192 A122660

Adjacent sequences:  A057788 A057789 A057790 * A057792 A057793 A057794

KEYWORD

nonn

AUTHOR

Leroy Quet, Nov 04 2000

STATUS

approved

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Last modified July 2 09:21 EDT 2020. Contains 335398 sequences. (Running on oeis4.)