318310

Appears in sequences

• Take the first n numbers written in base 3, concatenate them, then convert from base 3 to base 10.at n=6A048435
• The first n digits of the juxtaposition of the base-3 numbers converted to decimal.at n=11A055144
• Values of n for which the concatenations 1nn1, 3nn3, 7nn7 and 9nn9 are all primes.at n=21A102504
• Array read by antidiagonals: row b lists the base-b analog of the base-10 sequence 1, 12, 123, ..., 123456789, 12345678910, ... (A007908).at n=42A179069