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A068806 Ulam numbers that are powers of 2. 0
1, 2, 4, 8, 16, 8192, 16777216, 67108864 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
There are no other terms < 2^24. - Jud McCranie, Feb 12 2003
From Amiram Eldar, Aug 22 2020: (Start)
a(9) > 2^31.
The corresponding exponents of 2 are 0, 1, 2, 3, 4, 13, 24, 26, ...
The corresponding indices of Ulam numbers are 1, 2, 4, 6, 9, 694, 1241891, 4964116, ... (End)
LINKS
CROSSREFS
Intersection of A000079 and A002858.
Sequence in context: A281291 A346644 A164312 * A090804 A342773 A080281
KEYWORD
nonn,more
AUTHOR
Naohiro Nomoto, Mar 29 2002
EXTENSIONS
a(7)-a(8) from Amiram Eldar, Aug 22 2020
STATUS
approved

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Last modified June 16 11:09 EDT 2024. Contains 373429 sequences. (Running on oeis4.)