A031156 - OEIS

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

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OFFSET

1,2

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

LINKS

Table of n, a(n) for n=1..20.

CROSSREFS

Cf. A031142, A031155.

Sequence in context: A067488 A308310 A120785 * A099195 A041486 A196642

Adjacent sequences: A031153 A031154 A031155 * A031157 A031158 A031159

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane.

STATUS

approved