A081770Numbers twice their squarefree kernel (A007947).
4, 12, 20, 28, 44, 52, 60, 68, 76, 84, 92, 116, 124, 132, 140, 148, …
The first term appear at position 2.
14159265358979323846264338…
…543266482133936072602491412737245870066063155881748…
…51754108148303753443420841220816836058132623457677542…
…7136085169896247585984554122028186456856716496453824328…
…346568532371510581914169412202844534372725511917356601689…
| terms | string | first position | occurrences |
|---|---|---|---|
| 1 | 4 | 2 | 100,011,958 |
| 2 | 412 | 296 | 1,002,057 |
| 3 | 41220 | 153,874 | 9,885 |
| 4 | 4122028 | 8,895,876 | 95 |
| 5 | 412202844 | 577,155,277 | 1 |
| 6 | 41220284452 | not within 1,000,000,000 | 0 |
Searched the first 1,000,000,000 digits. Strings longer than 12 digits are not indexed.