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A287212
Ulam numbers k such that k/3 is also an Ulam number.
0
3, 6, 18, 48, 114, 414, 546, 627, 927, 1023, 1836, 3090, 4167, 7539, 7752, 7884, 7950, 8250, 9093, 9621, 9870, 10779, 11226, 11622, 11886, 12363, 12465, 14994, 16152, 17391, 19656, 20169, 20499, 22383, 23937, 25359, 25623, 26532, 26847, 27045, 27492, 28731, 31641, 31707
OFFSET
1,1
CROSSREFS
Cf. A002858.
Sequence in context: A148558 A148559 A108507 * A083337 A019308 A000932
KEYWORD
nonn
AUTHOR
Enrique Navarrete, May 21 2017
STATUS
approved