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URL: https://oeis.org/A177818

⇱ A177818 - OEIS

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A177818
Numbers k such that k^3 divides 18^(k^2) + 1.
9
1, 19, 397841, 1152331, 3566699, 24128658809, 74683110361, 216316727651, 1339092172657, 7967201553697
OFFSET
1,2
COMMENTS
19 divides a(n) for n > 1.
CROSSREFS
Cf. A127263 (k^3 divides 2^(k^2) + 1).
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
KEYWORD
more,nonn
AUTHOR
Alexander Adamchuk, May 14 2010
EXTENSIONS
a(6)-a(10) from Max Alekseyev, May 16 2010
STATUS
approved