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A193254
Sum of odd divisors of lambda(n).
2
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
1,7
COMMENTS
Lambda is the function in A002322.
LINKS
FORMULA
a(n) = A000593(A002322(n)).
EXAMPLE
a(19) = 13 because lambda(19) = 18 and the sum of the 3 odd divisors {1, 3, 9} is 13.
MATHEMATICA
Table[Total[Select[Divisors[CarmichaelLambda[n]], OddQ[ # ]&]], {n, 67}]
PROG
(PARI) a(n) = sumdiv(lcm(znstar(n)[2]), d, d*(d%2));
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Jul 22 2011
EXTENSIONS
More terms from Antti Karttunen, Aug 22 2017
STATUS
approved