A109749 Numbers n such that 88 * 10^n + 1 is prime.

1, 3, 4, 7, 18, 30, 82, 99, 105, 106, 147, 334, 1092, 1221, 3705, 5524, 30355, 35962

Offset: 1

Author

Jason Earls, Aug 11 2005

Keywords

• more
• nonn

Comments

All terms have been certified. Primality proof for the largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] Primality testing 88*10^30355+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Calling Brillhart-Lehmer-Selfridge with factored part 69.89% 88*10^30355+1 is prime! (491.3713s+0.8690s)

Links

• Makoto Kamada, Search for 880w1.

Crossrefs

Cf. A056804, A056797.

Programs

PARI

is(n)=ispseudoprime(88*10^n+1) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

a(18) from Kamada data by Tyler Busby, Apr 16 2024