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

1,2

Links

Table of n, a(n) for n=1..30.

Crossrefs

Cf. A002858, A068799.

Sequence in context: A131420 A095705 A034776 * A219968 A126042 A076227

Adjacent sequences: A068788 A068789 A068790 * A068792 A068793 A068794

Keyword

more,nonn

Author

Naohiro Nomoto, Mar 29 2002

Extensions

More terms from Jud McCranie, Feb 12 2003

Status

approved