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A375471
Integers equal to the sum of divisors of their anti-divisors.
0
3, 4, 16, 61, 1861, 4979, 90191, 58981439, 10024953661
OFFSET
1,1
COMMENTS
Tested up tp 2*10^10. - Giovanni Resta, Aug 19 2024
EXAMPLE
Anti-divisors of 1861 are 2, 3, 17, 51, 61, 73, 219, 1241 and
sum of sigmas = 3 + 4 + 18 + 72 + 62 + 74 + 296 + 1332 = 1861.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Paolo P. Lava, Aug 17 2024
EXTENSIONS
a(8)-a(9) from Giovanni Resta, Aug 19 2024
STATUS
approved