A064991 In A064990, drop leading 0's from A_k (for k>0) and convert to decimal.

0, 1, 78, 20487601, 369071811667060977001038, 2157596228176369025492751451130809592490957353466093604326704974092869041

Offset: 0

Author

Michael Gilleland (megilleland(AT)yahoo.com), Oct 31 2001

Keywords

• nonn
• easy
• base

Comments

Next term is about 4.31*10^218.

Formula

a(n+1) = a(n)(4^3^n + 2^3^n - 1) + 2^3^n - 1. - David Wasserman, Aug 20 2002

Extensions

More terms from David Wasserman, Aug 20 2002