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A054251 a(0) = 1; a(n) = Sum(0 <= k < n and GCD(k, n) != 1; a(k)). 1
1, 0, 1, 1, 2, 1, 5, 1, 9, 7, 19, 1, 45, 1, 83, 79, 165, 1, 417, 1, 827, 639, 1575, 1, 3875, 927, 7025, 5069, 14689, 1, 35461, 1, 64199, 47175, 128399, 52727, 309767, 1, 566565, 409567, 1186863, 1, 2835257, 1, 5202425, 4888729, 10357675, 1, 26066615 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..48.

CROSSREFS

Cf. A045545.

Sequence in context: A093127 A115123 A132081 * A163963 A119763 A092142

Adjacent sequences:  A054248 A054249 A054250 * A054252 A054253 A054254

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified February 17 10:59 EST 2019. Contains 320219 sequences. (Running on oeis4.)