A230634 Numbers n such that m + (sum of digits in base-4 representation of m) = n has exactly two solutions.

17, 19, 21, 34, 36, 38, 51, 53, 55, 65, 67, 70, 72, 82, 84, 86, 99, 101, 103, 116, 118, 120, 130, 132, 135, 137, 147, 149, 151, 164, 166, 168, 181, 183, 185, 195, 197, 200, 202, 212, 214, 216, 229, 231, 233, 246, 248, 250, 257, 261, 262, 263, 267, 274, 276, 278, 291, 293, 295, 308, 310, 312, 322, 324, 327, 329, 339

Offset

1,1

Links

Donovan Johnson, Table of n, a(n) for n = 1..10000

Index entries for Colombian or self numbers and related sequences

Mathematica

etsQ[n_]:=Count[#+Total[IntegerDigits[#, 4]]&/@Range[n-1], n]==2; Select[ Range[ 350], etsQ] (* Harvey P. Dale, May 25 2016 *)

Crossrefs

Related base-4 sequences: A053737, A230631, A230632, A010064, A230633, A230634, A230635, A230636, A230637, A230638, A010065 (trajectory of 1)

Sequence in context: A194389 A030127 A115849 * A354880 A054484 A054796

Adjacent sequences: A230631 A230632 A230633 * A230635 A230636 A230637

Keyword

nonn,base

Author

N. J. A. Sloane, Oct 30 2013

Status

approved