20000010

Appears in sequences

• a(n) = (largest prime < 10^n) + (smallest prime > 10^n).at n=6A097515
• Concatenate the positions of digits 0, 1,..., 9 in the decimal representation of n, using 1 for the rightmost digit etc., and 0 when the digit does not occur.at n=28A260519
• Concatenate the positions of digits 9, 8,..., 0 in the decimal representation of n, using 1 for the leftmost digit etc., and 0 when the digit does not occur.at n=17A260522