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A115014 a(n) = Sum_{i=1..n, gcd(6,i)=1} i. 1
1, 1, 1, 1, 6, 6, 13, 13, 13, 13, 24, 24, 37, 37, 37, 37, 54, 54, 73, 73, 73, 73, 96, 96, 121, 121, 121, 121, 150, 150, 181, 181, 181, 181, 216, 216, 253, 253, 253, 253, 294, 294, 337, 337, 337, 337, 384, 384, 433, 433, 433, 433, 486, 486, 541, 541, 541, 541, 600, 600, 661 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
MATHEMATICA
Table[Sum[k*KroneckerDelta[GCD[6, k], 1], {k, n}], {n, 80}] (* Wesley Ivan Hurt, Jan 20 2024 *)
CROSSREFS
Cf. A115012.
Sequence in context: A272349 A262850 A262849 * A168332 A214828 A229828
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Feb 24 2006
STATUS
approved

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Last modified May 22 10:24 EDT 2024. Contains 372745 sequences. (Running on oeis4.)