A177907 Numbers k such that k^3 divides 7^(k^2) - 1.

1, 2, 3, 4, 6, 8, 10, 12, 20, 24, 30, 40, 50, 57, 60, 68, 78, 100, 110, 111, 114, 120, 136, 150, 156, 200, 204, 220, 222, 228, 258, 300, 312, 330, 340, 390, 408, 440, 444, 456, 516, 550, 570, 600, 660, 680, 780, 820, 876, 888, 930, 1010, 1020, 1032, 1086, 1100

Offset

1,2

Links

Robert Price, Table of n, a(n) for n = 1..2835

Mathematica

Select[Range[1100], Divisible[7^(#^2)-1, #^3]&] (* Harvey P. Dale, Nov 05 2011 *)

Crossrefs

Cf. A067947 (k divides 7^k-1), A127107 (k^2 divides 7^k-1).

Cf. A129211, A129212, A177905, A127106, A177907, A127102, A177909, A177243.

Cf. A177911, A177912, A177913, A177914, A177915, A177916, A177917, A177918, A177919, A177920.

Sequence in context: A029469 A061953 A029517 * A083006 A352929 A096061

Adjacent sequences: A177904 A177905 A177906 * A177908 A177909 A177910

Keyword

nonn

Author

Alexander Adamchuk, May 14 2010

Status

approved