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URL: https://oeis.org/A106136

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A106136

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

1

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

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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

Sequence in context: A389264 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