142748

Appears in sequences

• n*10^7-1, n*10^7-3, n*10^7-7 and n*10^7-9 are all prime.at n=8A064982
• Power ceiling-floor sequence of 2 + sqrt(3).at n=8A214998
• a(n) = (A259756(n)-1)/8.at n=14A275417