A177818 Numbers k such that k^3 divides 18^(k^2) + 1.

1, 19, 397841, 1152331, 3566699, 24128658809, 74683110361, 216316727651, 1339092172657, 7967201553697

Offset

1,2

Comments

19 divides a(n) for n > 1.

Links

Table of n, a(n) for n=1..10.

Crossrefs

Cf. A127263 (k^3 divides 2^(k^2) + 1).

Cf. A128678, A128679, A128680, A128681, A128682, A128683, A128684, A128685.

Cf. A177813, A177814, A177816, A177817, A177818, A177819, A177820.

Cf. A128677 (least k > p such that (k*p)^3 divides (p-1)^(k*p)^2+1, where p = prime(n) > 2).

Sequence in context: A013764 A078353 A347813 * A269446 A172824 A070632

Adjacent sequences: A177815 A177816 A177817 * A177819 A177820 A177821

Keyword

more,nonn

Author

Alexander Adamchuk, May 14 2010

Extensions

a(6)-a(10) from Max Alekseyev, May 16 2010

Status

approved