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A106128
Numbers k such that the k-th semiprime == 3 (mod k).
2
1, 3, 6, 36, 46, 78, 6915, 6916, 613375, 613378, 613404, 613406, 613414, 613438, 613448, 613454, 613456, 613508, 613519, 613522, 613532, 613559, 613568, 613570, 613582, 613586, 613598, 58155528, 58155536, 58155549, 6384425454, 6384425520, 6384425522, 6384425528, 6384425638
OFFSET
1,2
COMMENTS
a(48) > 10^12. - Lucas A. Brown, Oct 13 2022
LINKS
Lucas A. Brown, semiprimemods.py
EXAMPLE
a(3) = 6 is a term because the 6th semiprime is 15 and 15 == 3 (mod 6).
CROSSREFS
Sequence in context: A358669 A130317 A019467 * A119186 A119115 A079653
KEYWORD
hard,nonn
AUTHOR
Shyam Sunder Gupta, May 07 2005
EXTENSIONS
a(28)-a(30) from Donovan Johnson, Oct 29 2008
a(1), a(2), and a(31)-a(47) by Lucas A. Brown, Oct 19 2020
STATUS
approved