id:A088183 - OEIS Search Results

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Number of ways to write n as a sum of two coprime semiprimes.

+0
3

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 2, 0, 0, 0, 1, 0, 1, 0, 0, 0, 2, 0, 3, 0, 0, 1, 1, 0, 2, 0, 2, 0, 2, 0, 4, 1, 0, 1, 4, 0, 2, 0, 1, 0, 3, 0, 4, 0, 1, 2, 5, 0, 6, 0, 1, 3, 1, 0, 4, 1, 3, 0, 6, 0, 5, 3, 1, 2, 3, 0, 5, 0, 3, 2, 7, 0, 1, 3, 4, 1, 4, 0, 6, 2, 2, 3, 6, 0, 7, 1, 4, 2, 6, 1 (list; graph; listen)

	OFFSET	`1,19`
	COMMENT	`a(A088184(n))>0, a(A088185(n))=0;` `is a(n)>0 for n>210? see conjecture in A072931.` `The graph of this sequence is compelling evidence that 210 is the last term of sequence A088185. - T. D. Noe, Apr 10 2007`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000` `Eric Weisstein's World of Mathematics, Semiprime` `Eric Weisstein's World of Mathematics, Relatively Prime`
	EXAMPLE	`a(64)=3: 64 = 33+511 = 35+77 = 55+313, (A072931(64)=5).`
	CROSSREFS	`Cf. A072931, A001358.` `Sequence in context: A083917 A117974 A085983 this_sequence A070140 A081212 A085491` `Adjacent sequences: A088180 A088181 A088182 this_sequence A088184 A088185 A088186`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 22 2003`

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Last modified September 7 23:08 EDT 2008. Contains 143486 sequences.

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