bn=n-1/25
b1=1-1/25=0/25=0
b2=2-1/25=1/25=0.04
b3=3-1/25=2/25=0.08
b4=4-1/25=3/25=0.12
b5=5-1/25=4/25=0.16
b6=6-1/25=5/25=0.2
b7=7-1/25=6/25=0.24
b8=8-1/25=7/25=0.28
b9=9-1/25=8/25=0.32
b10=10-1/25=9/25=0.36
b11=11-1/25=10/25=0.4
b12=12-1/25=11/25=0.44
b13=13-1/25=12/25=0.48
b14=14-1/25=13/25=0.52
b15=15-1/25=14/25=0.56
b16=16-1/25=15/25=0.6
b17=17-1/25=16/25=0.64
b18=18-1/25=17/25=0.68
b19=19-1/25=18/25=0.72
b20=20-1/25=19/25=0.76
b21=21-1/25=20/25=0.8
b22=22-1/25=21/25=0.84
b23=23-1/25=22/25=0.88
b24=24-1/25=23/25=0.92
b25=25-1/25=24/25=0.96
b26=26-1/25=25/25=1
Итак, меньше 1 - 25 членов этой последовательности.