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A171217 Numbers of the form (noncomposite number)^(noncomposite number), but not p^p where p is prime. 0
1, 2, 3, 5, 7, 8, 9, 11, 13, 17, 19, 23, 25, 29, 31, 32, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 121, 125, 127, 128, 131, 137, 139, 149, 151, 157, 163, 167, 169, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The union of {1}, the primes A000040, and powers of the form p^q where p and q are distinct primes.
LINKS
CROSSREFS
Sequence in context: A359059 A328320 A086539 * A344591 A049468 A187332
KEYWORD
nonn
AUTHOR
EXTENSIONS
Attribute "power-free" removed from the definition by R. J. Mathar, Dec 09 2009
Inserted a(19)=43 by Gionata Neri, Dec 28 2015
STATUS
approved

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Last modified March 2 12:34 EST 2024. Contains 370467 sequences. (Running on oeis4.)