A229167 a(n) = smallest index i such that A010062(i) >= 2^n.

0, 1, 3, 5, 8, 14, 22, 40, 71, 126, 224, 397, 721, 1318, 2431, 4531, 8493, 15999, 30234, 57281, 108744, 206868, 394293, 752985, 1440705, 2761606, 5302954, 10200322, 19652438, 37921447, 73277740, 141783308, 274656312, 532615214, 1033834916, 2008466475, 3905027107

Offset: 0

Author

Patrick Devlin and N. J. A. Sloane, Sep 27 2013

Keywords

• nonn

Examples

			The first time A010062(i) is >= 16 is A010062(8) = 17, so a(4) = 8.
		

Links

• Donovan Johnson, Table of n, a(n) for n = 0..46
• Index entries for Colombian or self numbers and related sequences

Crossrefs

Cf. A000120, A010062.

Programs

Maple

# uses wt() from A000120
t1:=[0]; a:=1; l:=1;
for i from 1 to 1000000 do
a:=a+wt(a);
if a >= 2^l then l:=l+1; t1:=[op(t1),i]; fi;
od:
t1;

Extensions

a(24)-a(36) from Donovan Johnson, Sep 27 2013