A005150Look and Say sequence: describe the previous term! (method A - initial term is 1).
1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211, 31131211131221, 13211311123113112211, 11131221133112132113212221, 3113112221232112111312211312113211, 1321132132111213122112311311222113111221131221, 11131221131211131231121113112221121321132132211331222113112211, 311311222113111231131112132112311321322112111312211312111322212311322113212221
The first 4 terms appear at position 802,177,755.
1415926535897932384626433…
…955058223172535940812848111745028410270193852110555…
…31775437885967767291952611121385919472545140030118050…
…524370850870694485018036111211211346333381372989901174423…
| terms | string | first position | occurrences |
|---|---|---|---|
| 1 | 1 | 1 | 99,997,334 |
| 2 | 111 | 153 | 1,000,046 |
| 3 | 11121 | 47,801 | 9,907 |
| 4 | 111211211 | 802,177,755 | 2 |
Searched the first 1,000,000,000 digits. Strings longer than 12 digits are not indexed.