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A086005 Semiprimes sandwiched between semiprimes. +0
8
34, 86, 94, 122, 142, 202, 214, 218, 302, 394, 446, 634, 698, 842, 922, 1042, 1138, 1262, 1346, 1402, 1642, 1762, 1838, 1894, 1942, 1982, 2102, 2182, 2218, 2306, 2362, 2434, 2462, 2518, 2642, 2722, 2734, 3098, 3386, 3602, 3694, 3866, 3902 (list; graph; listen)
OFFSET

1,1

COMMENT

a(n) = 2*A086006(n).

LINKS

Eric Weisstein's World of Mathematics, Semiprime

EXAMPLE

94=47*2: 94-1=3*31 and 94+1=5*19, therefore 94 is a term.

CROSSREFS

Cf. A001358.

Sequence in context: A036199 A092223 A046764 this_sequence A140602 A067977 A044221

Adjacent sequences: A086002 A086003 A086004 this_sequence A086006 A086007 A086008

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 07 2003

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Last modified July 6 17:22 EDT 2008. Contains 140988 sequences.


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