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A278546 Even numbers that cannot be expressed as a sum of 3 or fewer terms of A035928. 0
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 (list; graph; refs; listen; history; text; internal format)
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: A017365 A084394 A085248 * A092163 A100592 A028563

Adjacent sequences:  A278543 A278544 A278545 * A278547 A278548 A278549

KEYWORD

nonn,more

AUTHOR

Jeffrey Shallit, Nov 23 2016

STATUS

approved

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Last modified September 18 04:22 EDT 2021. Contains 347508 sequences. (Running on oeis4.)