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A068791 Ulam numbers such that 2*n is also an Ulam number. 4
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 28 10:02 EST 2022. Contains 358411 sequences. (Running on oeis4.)