1889587

Appears in sequences

• Composite numbers whose prime factors contain no digits other than 7 and 8.at n=30A036323
• a(0)=0, a(1)=1, a(2n)=18*a(n), a(2n+1)=a(2n)+1.at n=35A197352
• a(n) = n^5 + n + 1.at n=18A271209