Proth primes of the form 8•3ⁿ+1

Current data

`k` , `b` :	8 , 3
Count :	23
Nash :	2226
Max `n` :	1,250,000
Date :	2020-08-08

2^[1], 7, 8^[2], 10^[3], 22^[4], 52^[5], 58^[6], 76^[7], 130^[8], 143, 331, 332^[9], 980^[10], 1282^[11], 1655, 4031, 4600^[12], 18880^[13], 89482^[14], 130592^[15], 323860^[16], 872171, 1172480^[17]

Remarks :

See also Williams 8•9ⁿ+1
The sequence A005538 in OEIS

Notes

History

2020-08-08: Checked to n = 1250000, Paul Vanderveen
2020-07-08: Checked to n = 1200000, Paul Vanderveen
2020-06-08: Checked to n = 850000, Paul Vanderveen
2020-05-25: Checked to n = 50000, Karsten Bonath
2020-05-17: Found n = 1172480, Paul Vanderveen
2004-09-21: Found n = 130592, Peter Benson
1998-11-08: Found n = 18880, Chris Caldwell

[1] Twin n=2, Williams 8•9¹+1

[2] Cullen 8•3⁸+1, Williams 8•9⁴+1

[3] Twin n=10, Williams 8•9⁵+1

[4] Williams 8•9¹¹+1

[5] Williams 8•9²⁶+1

[6] Williams 8•9²⁹+1

[7] Williams 8•9³⁸+1

[8] Williams 8•9⁶⁵+1

[9] Williams 8•9¹⁶⁶+1

[10] Williams 8•9⁴⁹⁰+1

[11] Williams 8•9⁶⁴¹+1

[12] Williams 8•9²³⁰⁰+1

[13] Williams 8•9⁹⁴⁴⁰+1

[14] Williams 8•9⁴⁴⁷⁴¹+1

[15] Williams 8•9⁶⁵²⁹⁶+1

[16] Williams 8•9¹⁶¹⁹³⁰+1

[17] Williams 8•9⁵⁸⁶²⁴⁰+1

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Proth primes of the form 8•3ⁿ+1

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Proth primes of the form 8•3n+1

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Proth primes of the form 8•3ⁿ+1