| 4+8+12+...+4n | ||
an= |  | |
| n+2 |
| n(2n+2) | |||||||||
an= | = | |||||||||
| n+2 | n+2 |
| (n+1)(2(n+1)+2) | n(2n+2) | |||
an+1−an= | − | = | ||
| n+1+2 | n+2 |
| (n+1)(2n+4)(n+2)−n(2n+2)(n+3) | 2(n+1)(n+4) | |||
= | > 0 (bo n>0), więc | |||
| (n+2)(n+3) | (n+2)(n+3) |
| 5^2 | 52 |
| 2^{10} | 210 |
| a_2 | a2 |
| a_{25} | a25 |
| p{2} | √2 |
| p{81} | √81 |
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