A068791 Ulam numbers such that 2*n is also an Ulam number.

1, 2, 3, 4, 8, 13, 18, 36, 53, 57, 69, 206, 273, 400, 983, 1308, 2581, 3205, 4118, 13531, 14892, 88552, 139128, 171243, 278063, 332182, 694354, 3416773, 4311381, 4867024

Offset: 1

Author

Naohiro Nomoto, Mar 29 2002

Keywords

• more
• nonn

Crossrefs

Cf. A002858, A068799.

Extensions

More terms from Jud McCranie, Feb 12 2003