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A068799 Ulam numbers such that n/2 is also an Ulam number. 2
2, 4, 6, 8, 16, 26, 36, 72, 106, 114, 138, 412, 546, 800, 1966, 2616, 5162, 6410, 8236, 27062, 29784, 177104, 278256, 342486, 556126, 664364, 1388708, 6833546, 8622762, 9734048 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Table of n, a(n) for n=1..30.
FORMULA
a(n) = 2 * A068791(n). - Sean A. Irvine, Mar 15 2024
CROSSREFS
Cf. A002858, A068791.
Sequence in context: A316225 A100685 A296993 * A317306 A317087 A100778
Adjacent sequences: A068796 A068797 A068798 * A068800 A068801 A068802
KEYWORD
easy,nonn
AUTHOR
Naohiro Nomoto, Mar 29 2002
EXTENSIONS
More terms from Jud McCranie, Feb 12 2003
STATUS
approved

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Last modified May 18 11:53 EDT 2024. Contains 372630 sequences. (Running on oeis4.)