A001520a(n) = (6*n+1)*(6*n+3)*(6*n+5).
15, 693, 3315, 9177, 19575, 35805, 59163, 90945, 132447, 184965, 249795, 328233, 421575, 531117, 658155, 803985, …
The first term appear at position 3.
1415926535897932384626433832…
…43248996307701137134467515693024488548207712413355773…
| terms | string | first position | occurrences |
|---|---|---|---|
| 1 | 15 | 3 | 10,001,496 |
| 2 | 15693 | 113,221 | 10,015 |
| 3 | 156933315 | not within 1,000,000,000 | 0 |
Searched the first 1,000,000,000 digits. Strings longer than 12 digits are not indexed.