A128683 Numbers k such that k^3 divides 10^(k^2) + 1.

1, 11, 253, 11891, 35167, 45023, 47927, 96569, 276859, 640343, 1035529, 1102321, 1652849, 2221087, 6367757, 16339367, 19588019, 26499979, 30096121, 48669863, 51809087, 74901409, 88023001, 89007677, 104391089, 105080767, 143938531

Offset

1,2

Comments

11 divides a(n) for n > 1.

Links

Chai Wah Wu, Table of n, a(n) for n = 1..92

Mathematica

Select[Range[5*10^6], Mod[ 10^(#^2)+1, #^3]==0 &] (* G. C. Greubel, Jan 18 2018 *)

Crossrefs

Cf. A127263, A128677, A128678, A128679, A128680, A128681, A128682, A128684, A128685, A292335.

Sequence in context: A012154 A009055 A009067 * A292335 A177912 A128405

Adjacent sequences: A128680 A128681 A128682 * A128684 A128685 A128686

Keyword

hard,nonn

Author

Alexander Adamchuk, Mar 31 2007

Extensions

More terms from J. Mulder (jasper.mulder(AT)planet.nl), Jan 26 2010

Terms a(16) onward from Max Alekseyev and Alexander Adamchuk, May 12 2010

Status

approved