id:A131848 - OEIS Search Results

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Least nonnegative number which when added to the n-th semiprime gives a multiple of n.

+0
1

0, 0, 0, 2, 1, 3, 0, 2, 2, 4, 0, 2, 4, 4, 6, 2, 2, 3, 2, 3, 5, 4, 4, 3, 1, 1, 26, 27, 1, 3, 2, 3, 5, 7, 34, 33, 33, 34, 37, 39, 1, 3, 0, 43, 1, 43, 46, 1, 2, 4, 49, 50, 0, 1, 54, 55, 51, 54, 53, 55, 57, 54, 51, 54, 57, 59, 62, 63, 63, 66, 69, 71, 1, 3, 4, 2, 73, 75, 69, 71 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`This is to semiprimes A001358 as A068901 is to primes A000040.`
	FORMULA	`a(n) = MIN{k=>0 such that n\|(k+A001358(n))}.`
	EXAMPLE	`a(1) = 0 because 1 \| (0+semiprime(1)=4).` `a(6) = 3 because 6 \| (3+semiprime(3)=3+15=18).` `a(25) = 1 because 25 \| (1+semiprime(25)=1+74=75).`
	CROSSREFS	`Cf. A000040, A001358, A068901.` `Sequence in context: A071461 A091829 A104512 this_sequence A035157 A087469 A022328` `Adjacent sequences: A131845 A131846 A131847 this_sequence A131849 A131850 A131851`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Oct 04 2007`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 15 2008`

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Last modified December 17 19:39 EST 2009. Contains 170821 sequences.

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