A098871 - OEIS

A098871

Sums of distinct powers of 4 plus 1.

1, 2, 5, 6, 17, 18, 21, 22, 65, 66, 69, 70, 81, 82, 85, 86, 257, 258, 261, 262, 273, 274, 277, 278, 321, 322, 325, 326, 337, 338, 341, 342, 1025, 1026, 1029, 1030, 1041, 1042, 1045, 1046, 1089, 1090, 1093, 1094, 1105, 1106, 1109, 1110, 1281, 1282, 1285, 1286

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..51.

Lukasz Merta, Composition inverses of the variations of the Baum-Sweet sequence, arXiv:1803.00292 [math.NT], 2018. See u(n) p. 11.

FORMULA

a(n) = A000695(n) + 1. - Franklin T. Adams-Watters, Aug 17 2013

MAPLE

a:= proc(n) local m, r, b; m, r, b:= n, 1, 1;

while m>0 do r:= r+b*irem(m, 2, 'm'); b:= b*4 od; r

end:

seq(a(n), n=0..100); # Alois P. Heinz, Aug 17 2013

MATHEMATICA

(* first do *) Needs["DiscreteMath`Combinatorica`"]; (* then *) Take[ Sort[ Plus @@@ Subsets[ Table[4^n, {n, 0, 5}]]] + 1, 50] (* Robert G. Wilson v, Oct 23 2004 *)

Total/@Subsets[4^Range[0, 5], 10]+1//Union (* Harvey P. Dale, May 03 2019 *)

CROSSREFS

Cf. A003278.

Sequence in context: A029939 A082198 A342488 * A227623 A146477 A348439

Adjacent sequences: A098868 A098869 A098870 * A098872 A098873 A098874

KEYWORD

nonn

AUTHOR

Tom C. Brown (tbrown(AT)sfu.ca), Oct 13 2004

EXTENSIONS

More terms from Robert G. Wilson v, Oct 23 2004

STATUS

approved