OFFSET
1,1
COMMENTS
Most seem to be multiples of 5.
LINKS
EXAMPLE
135 = 3^3 * 5, sigma(135) = 240 = 2^4 * 3 * 5, and A003961(135) = 875 = 5^3 * 7 have 5 as their common divisor, therefore 135 is present in this sequence.
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 19 2024
STATUS
approved