A036116 - OEIS

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A036116

Numbers n such that the number of distinct primes dividing n is a square.

1, 2, 3, 4, 5, 7, 8, 9, 11, 13, 16, 17, 19, 23, 25, 27, 29, 31, 32, 37, 41, 43, 47, 49, 53, 59, 61, 64, 67, 71, 73, 79, 81, 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, 210, 211, 223, 227, 229, 233, 239, 241, 243, 251, 256, 257, 263, 269, 271, 277, 281 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	EXAMPLE	`8 = 2^3 is divisible by just one (distinct) prime, 2 and 1 is a square, so 8 is in the sequence.`
	MAPLE	`readlib(issqr): with(numtheory): select(x->issqr(nops(factorset(x))), [ seq(n, n=1..300) ]);`
	CROSSREFS	`Sequence in context: A087441 A059046 A144711 * A000961 A128603 A195943` `Adjacent sequences: A036113 A036114 A036115 * A036117 A036118 A036119`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.