id:A086006 - OEIS Search Results

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Primes p such that 2*p-1 and 2*p+1 are semiprimes.

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17, 43, 47, 61, 71, 101, 107, 109, 151, 197, 223, 317, 349, 421, 461, 521, 569, 631, 673, 701, 821, 881, 919, 947, 971, 991, 1051, 1091, 1109, 1153, 1181, 1217, 1231, 1259, 1321, 1361, 1367, 1549, 1693, 1801, 1847, 1933, 1951, 1979, 2143, 2207 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n) = A086005(n)/2.`
	EXAMPLE	`A000040(26)=101: 2101-1=201=367, 2101+1=203=729, therefore` `101 is a term, a(6)=101=A086005(6)/2.`
	CROSSREFS	`Cf. A001358, A000040.` `Adjacent sequences: A086003 A086004 A086005 this_sequence A086007 A086008 A086009` `Sequence in context: A044094 A044475 A024188 this_sequence A118587 A123592 A109998`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 07 2003`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

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