A218717 a(n) is smallest number such that a(n)^2 + 1 is divisible by 73^n.

0, 27, 776, 153765, 6459524, 404034898, 41865466758, 3219884218827, 239822883201307, 9110883894036198, 991706090146518323, 142813358470363920740, 8641533837443707913816, 586811715371303018585730, 2756887299416274753296336, 729513196939063257288876118

Offset

0,2

Links

Table of n, a(n) for n=0..15.

Example

a(3) = 153765 because 153765^2+1 = 2 * 73 ^ 3 * 30389.

Mathematica

b=27; n73=73; jo=Join[{0, b}, Table[n73=73*n73; b=PowerMod[b, 73, n73]; b=Min[b, n73-b], {99}]]

Crossrefs

Cf. A002522, A049532, A034939, A218709, A218710, A218712, A218713, A218714, A218715, A218716.

Sequence in context: A232951 A138979 A183505 * A159234 A120715 A065922

Adjacent sequences: A218714 A218715 A218716 * A218718 A218719 A218720

Keyword

nonn

Author

Michel Lagneau, Nov 04 2012

Status

approved