A031156 a(n) = 2^A031142(n).

1, 16, 128, 8192, 16384, 262144, 16777216, 134217728, 2147483648, 17179869184, 137438953472, 562949953421312, 2251799813685248, 147573952589676412928, 4722366482869645213696, 75557863725914323419136, 151115727451828646838272, 2417851639229258349412352, 77371252455336267181195264, 680564733841876926926749214863536422912

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• base

Comments

Powers of 2 such that there is an increasing number of nonzero digits after the rightmost digit 0, including a leading 0. a(20)=2^129 is the first term where the rightmost 0 is not the leading 0. - Hugo Pfoertner, Apr 12 2020

Crossrefs

Cf. A031142, A031155.