A278546 Even numbers that cannot be expressed as a sum of 3 or fewer terms of A035928.

8, 18, 28, 130, 134, 138, 148, 158, 176, 318, 530, 538, 548, 576, 644, 1300, 2170, 2202, 2212, 2228, 2230, 2248, 8706, 8938, 8948, 34970, 35082

Offset

1,1

Comments

This is conjectured to be the complete list. There are no other examples smaller than 16773120.

Links

Table of n, a(n) for n=1..27.

Mathematica

nn = 10^5; Complement[Range[2, nn, 2], Union@ Map[Total, Rest@ Tuples[{0}~Join~#, 3]] &@ Select[Range@ nn, Function[k, Reverse[# /. {1 -> 0, 0 -> 1}] == # &@ IntegerDigits[k, 2]]]] (* Michael De Vlieger, Nov 23 2016, after Harvey P. Dale at A035928 *)

Crossrefs

Cf. A035928, A278465.

Sequence in context: A352735 A084394 A085248 * A092163 A100592 A028563

Adjacent sequences: A278543 A278544 A278545 * A278547 A278548 A278549

Keyword

nonn,more

Author

Jeffrey Shallit, Nov 23 2016

Status

approved