A193254 Sum of odd divisors of lambda(n).
1, 1, 1, 1, 1, 1, 4, 1, 4, 1, 6, 1, 4, 4, 1, 1, 1, 4, 13, 1, 4, 6, 12, 1, 6, 4, 13, 4, 8, 1, 24, 1, 6, 1, 4, 4, 13, 13, 4, 1, 6, 4, 32, 6, 4, 12, 24, 1, 32, 6, 1, 4, 14, 13, 6, 4, 13, 8, 30, 1, 24, 24, 4, 1, 4, 6, 48, 1, 12, 4, 48, 4, 13, 13, 6, 13, 24, 4, 56, 1, 40, 6, 42, 4, 1, 32, 8, 6, 12, 4, 4, 12, 24, 24, 13, 1, 4, 32, 24, 6, 31, 1, 72, 4, 4
Offset: 1
Keywords
Examples
a(19) = 13 because lambda(19) = 18 and the sum of the 3 odd divisors {1, 3, 9} is 13.
Links
- Antti Karttunen, Table of n, a(n) for n = 1..10000
Programs
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Mathematica
Table[Total[Select[Divisors[CarmichaelLambda[n]], OddQ[ # ]&]], {n, 67}] -
PARI
a(n) = sumdiv(lcm(znstar(n)[2]), d, d*(d%2));
Extensions
More terms from Antti Karttunen, Aug 22 2017
Comments