Method: visualization of the distribution of different digits (from 0 to 9) in the decimal representation of the number 
.
For, example, the digit «1» is presented on the following places of the number :
123456789*123456789*123456789*123456789*123456789*
31415926535897932384626433832795028841971693993751
05820974944592307816406286208998628034825342117067
98214808651328230664709384460955058223172535940812
84811174502841027019385211055596446229489549303819
644288109756659334461284756482337867831652........
For more details see the site of Alexander and Anton Zenkin.