A177919 - OEIS

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A177919

Numbers k such that k^3 divides 19^(k^2) - 1.

15

1, 2, 3, 4, 6, 9, 10, 12, 18, 20, 30, 36, 42, 60, 68, 78, 84, 90, 110, 126, 156, 180, 204, 210, 220, 222, 234, 252, 294, 330, 340, 362, 381, 390, 420, 438, 444, 468, 546, 588, 612, 630, 654, 660, 666, 724, 762, 780, 820, 876, 882, 930, 990, 1010, 1014, 1020

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Robert Price, Table of n, a(n) for n = 1..4378

MATHEMATICA

Select[ Range[10^4], Mod[ PowerMod[ 19, #^2, #^3 ] - 1, #^3 ] == 0 &]

CROSSREFS

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

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

Sequence in context: A144429 A260194 A014851 * A128399 A051404 A046097

Adjacent sequences: A177916 A177917 A177918 * A177920 A177921 A177922

KEYWORD

nonn

AUTHOR

Alexander Adamchuk, May 14 2010

STATUS

approved