id:A122466 - OEIS Search Results

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Semiprimes written in base 2.

+0
3

100, 110, 1001, 1010, 1110, 1111, 10101, 10110, 11001, 11010, 100001, 100010, 100011, 100110, 100111, 101110, 110001, 110011, 110111, 111001, 111010, 111110, 1000001, 1000101, 1001010, 1001101, 1010010, 1010101, 1010110, 1010111 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Semiprime analogue of A004676 Primes written in base 2. Partial sums are A122467; equivalently, this sequence is the first differences of A122467.`
	FORMULA	`a(n) = A007088(A001358(n)).`
	CROSSREFS	`Cf. A001358, A007088, A004676, A122467.` `Sequence in context: A033828 A162530 A115454 this_sequence A066511 A088477 A143919` `Adjacent sequences: A122463 A122464 A122465 this_sequence A122467 A122468 A122469`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Sep 09 2006`

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Last modified March 20 09:10 EDT 2010. Contains 173642 sequences.

AT&T Labs Research