A050993 5-Knödel numbers.

25, 65, 85, 145, 165, 185, 205, 265, 305, 365, 445, 485, 505, 545, 565, 685, 745, 785, 825, 865, 905, 965, 985, 1085, 1145, 1165, 1205, 1285, 1345, 1385, 1405, 1465, 1565, 1585, 1685, 1745, 1765, 1865, 1925, 1945, 1985, 2005, 2045, 2105, 2165

Offset: 1

Author

Eric W. Weisstein

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000
• John H. Castillo and Jhony Fernando Caranguay Mainguez, The set of k-units modulo n, arXiv:1708.06812 [math.NT], 2017.
• Eric Weisstein's World of Mathematics, Knödel Numbers

Crossrefs

Cf. A002997, A050990, A033553, A050992, A208154-A208158.

Programs

Mathematica

Select[Range[10, 2500, 5], Divisible[# - 5, CarmichaelLambda[#]]&] (* Jean-François Alcover, Mar 01 2018 *)