id:A102298 - OEIS Search Results

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Number of prime divisors with multiplicity of n+1 where n and n+1 are composite or twin composite numbers.

+0
1

2, 2, 2, 4, 2, 2, 2, 2, 3, 3, 2, 2, 2, 4, 2, 4, 3, 2, 2, 3, 2, 3, 2, 4, 2, 2, 3, 6, 2, 3, 2, 3, 3, 3, 2, 3, 4, 2, 2, 2, 2, 4, 2, 3, 2, 2, 2, 6, 3, 4, 3, 2, 2, 5, 2, 3, 3, 2, 2, 5, 2, 2, 2, 3, 3, 4, 2, 3, 2, 2, 4, 4, 2, 2, 2, 6, 2, 2, 3, 3, 3, 3, 2, 4, 2, 6, 2, 5, 3, 2, 2, 3, 3, 3, 3, 5, 2, 2, 2, 4, 2, 3, 2, 3, 4 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`For n=8 n+1 = 9 = 3*3 or 2 prime divisors with multiplicity.`
	PROGRAM	`(PARI) f(n) = for(x=1, n, y=composite(x)+1; if(!isprime(y), print1(bigomega(y)", "))) composite(n) =\The n-th composite number. 1 is def as not prime nor composite. { local(c, x); c=1; x=1; while(c <= n, x++; if(!isprime(x), c++); ); return(x) }`
	CROSSREFS	`Sequence in context: A138260 A027387 A111735 this_sequence A049298 A075016 A102445` `Adjacent sequences: A102295 A102296 A102297 this_sequence A102299 A102300 A102301`
	KEYWORD	`easy,nonn`
	AUTHOR	`Cino Hilliard (hillcino368(AT)gmail.com), Feb 19 2005`

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.

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