, , , , d, . d . :
an = a 1 + d (n 1).
- , -
- , -
- , -
n :
an+1 = an + d | |
d = an+1 - an | |
n- | an = a1+ d (n - 1) |
n |
, , , , .
:
1)
, , .
2) () : , ,
. n N, n≥2
3) a 1, a 2,..., an,... - k + n = m + p (k, n, m, p N),
ak + an = am + ap. |
Sn n
4) , , |
()
2- , . :
0, 1, 4, 9, 16, 25, 36,
, 2:
1, 3, 5, 7, 9, 11
. , n - n - .
:
ü , , .
ü 5 , .
ü , , . , .
ü
1) , : 1 = -5, d = 0,5
: