A106136 Numbers k such that the k-th semiprime == 11 (mod k).

1, 11, 98, 106, 108, 110, 6877, 6878, 6881, 6902, 6903, 6904, 6906, 6912, 613408, 613410, 613411, 613416, 613424, 613572, 613602, 58155530, 58155551, 58155552, 58155566, 58155567, 58155573, 6384425514, 6384425640, 819217006169, 819217006170, 819217006181, 819217006197

Offset

1,2

Comments

a(39) > 10^12. - Lucas A. Brown, Nov 23 2020

Links

Lucas A. Brown, Table of n, a(n) for n = 1..38

Lucas A. Brown, semiprimemods.py

Example

a(3)=98 is a term because the 98th semiprime (i.e., 305) == 11 (mod 98).

Crossrefs

Cf. A001358.

Sequence in context: A142260 A016140 A138930 * A223622 A130886 A239486

Adjacent sequences: A106133 A106134 A106135 * A106137 A106138 A106139

Keyword

nonn,hard

Author

Shyam Sunder Gupta, May 07 2005

Extensions

a(22)-a(27) from Donovan Johnson, Oct 29 2008

a(1), a(2), a(28)-a(38) by Lucas A. Brown, Nov 23 2020

Status

approved