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

Author

Naohiro Nomoto, Mar 29 2002

Keywords

• easy
• nonn

Crossrefs

Cf. A002858, A068791.

Formula

a(n) = 2 * A068791(n). - Sean A. Irvine, Mar 15 2024

Extensions

More terms from Jud McCranie, Feb 12 2003