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A181677 Semiprimes n such that tau(n-1), tau(n) and tau(n+1) are all also semiprime. 0
21, 33, 34, 35, 51, 86, 93, 94, 118, 123, 142, 143, 145, 146, 177, 202, 206, 213, 214, 218, 302, 303, 326, 334, 394, 446, 447, 453, 538, 566, 634, 698, 717, 723, 746, 802, 843, 866, 922, 926, 933, 1042, 1082, 1137, 1138, 1142 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..46.

CROSSREFS

Sequence in context: A075110 A219684 A219881 * A036382 A298855 A273201

Adjacent sequences:  A181674 A181675 A181676 * A181678 A181679 A181680

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Nov 18 2010

STATUS

approved

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Last modified February 15 22:28 EST 2019. Contains 320138 sequences. (Running on oeis4.)