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A285885 Ulam numbers n such that 3*n is also an Ulam number. 2
1, 2, 6, 16, 38, 138, 182, 209, 309, 341, 612, 1030, 1389, 2513, 2584, 2628, 2650, 2750, 3031, 3207, 3290, 3593, 3742, 3874, 3962, 4121, 4155, 4998, 5384, 5797, 6552, 6723, 6833, 7461, 7979, 8453, 8541, 8844, 8949, 9015, 9164, 9577, 10547, 10569, 11197, 11346 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It appears that there are many more values in this sequence than in A068791, Ulam numbers n such that 2*n is also an Ulam number.

LINKS

Table of n, a(n) for n=1..46.

CROSSREFS

Cf. A068791.

Sequence in context: A265107 A217631 A046209 * A273348 A198951 A078774

Adjacent sequences:  A285882 A285883 A285884 * A285886 A285887 A285888

KEYWORD

nonn

AUTHOR

Enrique Navarrete, Apr 27 2017

STATUS

approved

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Last modified November 13 20:57 EST 2019. Contains 329106 sequences. (Running on oeis4.)