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 A128679 Numbers n such that n^3 divides 5^(n^2)+1. 19
 1, 3, 21, 609, 903, 2667, 9429, 15501, 18543, 26187, 77343, 108507, 114681, 159663, 212541, 273441, 318507, 405447, 537747, 797349, 1197483, 1357503, 1398747, 1731387, 2354961, 3146703, 3325749, 4451181, 4630227, 4665801, 5192943 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 3 divides a(n) for n>1. 7 divides a(n) for n>2. LINKS CROSSREFS Cf. A127263 = numbers n such that n^3 divide 2^(n^2)+1. Cf. A128677 = Least k>p such that (kp)^3 divides (p-1)^(kp)^2+1, where p = Prime[n]>2. Cf. A128678, A128680, A128681, A128682, A128683, A128684, A128685. Sequence in context: A135748 A145386 A135327 * A111432 A180999 A181003 Adjacent sequences:  A128676 A128677 A128678 * A128680 A128681 A128682 KEYWORD hard,nonn AUTHOR Alexander Adamchuk, Mar 31 2007 EXTENSIONS More terms from Ryan Propper (rpropper(AT)cs.stanford.edu), Dec 31 2007 STATUS approved

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