id:A081091 - OEIS Search Results

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Primes of the form 2^i + 2^j + 1, i>j>0.

+0
9

7, 11, 13, 19, 37, 41, 67, 73, 97, 131, 137, 193, 521, 577, 641, 769, 1033, 1153, 2053, 2081, 2113, 4099, 4129, 8209, 12289, 16417, 18433, 32771, 32801, 32833, 40961, 65539, 133121, 147457, 163841, 262147, 262153, 262657, 270337, 524353, 524801 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A000120(a(n))=3.` `This is sequence A070739 without the Fermat primes, A000215. Sequence A081504 lists the i for which there are no primes. - T. D. Noe, Jun 22 2007`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	EXAMPLE	`13 = 2^3 + 2^2 + 1, therefore 13 is a term.`
	CROSSREFS	`Cf. A000040, A000215, A081092.` `Essentially the same as A070739.` `Cf. A095077 (primes with four bits set)` `Adjacent sequences: A081088 A081089 A081090 this_sequence A081092 A081093 A081094` `Sequence in context: A059308 A075521 A084444 this_sequence A027901 A129213 A110966`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 05 2003`

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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