A181677 Semiprimes n such that tau(n-1), tau(n) and tau(n+1) are all also semiprime.

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

Offset

1,1

Links

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

Crossrefs

Sequence in context: A075110 A219684 A219881 * A036382 A343454 A368949

Adjacent sequences: A181674 A181675 A181676 * A181678 A181679 A181680

Keyword

nonn

Author

Juri-Stepan Gerasimov, Nov 18 2010

Status

approved