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A086006 Primes p such that 2*p-1 and 2*p+1 are semiprimes. +0
7
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: 2*101-1=201=3*67, 2*101+1=203=7*29, 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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