Sigma Function | Examples | Prove sigma ( 12 n - 1 ) is congruent to 0 (mod 12) | Lecture - 16

1. Prove sigma ( 12 n - 1 ) is congruent to 0 (mod 12)
2. Prove sigma ( 24 n - 1 ) is congruent to 0 (mod 24)
3. Prove sigma ( 3 n + 2 ) is congruent to 0 (mod 3 )