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A192220 Semiprimes s such that tau(s-1)=tau(s+1) where tau=A000005. 0
4, 6, 9, 34, 51, 55, 86, 94, 129, 142, 183, 185, 202, 214, 218, 247, 249, 302, 341, 394, 415, 446, 471, 473, 535, 583, 634, 698, 723, 737, 807, 851, 905, 922, 926, 949, 1042, 1138, 1149, 1205, 1211, 1241, 1257, 1262, 1313, 1315, 1337, 1346, 1402, 1527, 1546, 1577, 1594, 1642, 1646, 1673, 1687 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..57.

FORMULA

A001358 INTERSECT A067888.

CROSSREFS

Cf. A001358, A067888, A067889.

Sequence in context: A085721 A190300 A081614 * A215477 A175459 A257652

Adjacent sequences:  A192217 A192218 A192219 * A192221 A192222 A192223

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Jun 26 2011

STATUS

approved

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Last modified August 28 00:41 EDT 2015. Contains 261101 sequences.