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A326065
Sum of divisors of the largest proper divisor of n: a(n) = sigma(A032742(n)).
6
1, 1, 1, 3, 1, 4, 1, 7, 4, 6, 1, 12, 1, 8, 6, 15, 1, 13, 1, 18, 8, 12, 1, 28, 6, 14, 13, 24, 1, 24, 1, 31, 12, 18, 8, 39, 1, 20, 14, 42, 1, 32, 1, 36, 24, 24, 1, 60, 8, 31, 18, 42, 1, 40, 12, 56, 20, 30, 1, 72, 1, 32, 32, 63, 14, 48, 1, 54, 24, 48, 1, 91, 1, 38, 31, 60, 12, 56, 1, 90, 40, 42, 1, 96, 18, 44, 30, 84, 1, 78, 14
OFFSET
1,4
FORMULA
a(n) = A000203(A032742(n)) = A000203(n) - A326066(n).
a(n) = A326135(n) * A000203(A020639(n)^(A067029(n)-1))).
PROG
(PARI)
A032742(n) = if(1==n, n, n/vecmin(factor(n)[, 1]));
A326065(n) = sigma(A032742(n));
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 06 2019
STATUS
approved