A068799 Ulam numbers such that n/2 is also an Ulam number.

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

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