A015940 Positive integers n such that 2^n == -3 (mod n).

1, 5, 917, 3223, 62911, 326329, 395819, 33504053, 4446226763, 17556128765, 141613728437, 5259417592253, 113837290408523

Offset: 1

Author

Robert G. Wilson v

Keywords

• nonn
• more

Comments

No other terms below 10^16.

Larger term: 18468744643735483963902321985787. - Max Alekseyev, Aug 01 2011

Links

• OEIS Wiki, 2^n mod n

Crossrefs

Cf. A050259.

Programs

Mathematica

Do[ If[ PowerMod[ 2, n, n ] + 3 == n, Print[n]], { n, 1, 10^9, 2 } ]

Extensions

Corrected and extended by Olivier Wittenberg, May 23 2004.

a(10)-a(13) from Max Alekseyev, Aug 01 2011