A088829 - OEIS

A088829

Even numbers with even abundance.

6, 10, 12, 14, 20, 22, 24, 26, 28, 30, 34, 38, 40, 42, 44, 46, 48, 52, 54, 56, 58, 60, 62, 66, 68, 70, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 130, 132, 134, 136, 138, 140, 142, 146, 148, 150, 152

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Odd numbers with odd abundance are in A016754. Odd numbers with even abundance are in A088828. Even numbers with odd abundance are in A088827.

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

EXAMPLE

Even perfect numbers are here.

n=10: sigma[10]=18, abundance=18-20=-2<0;

n=12: sigma[12]=28, abundance=28-24=+4>0.

sigma[n] is also even number; sign of abundance:<=>0.