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A065910 Second solution mod p of x^4 = 2 for primes p such that more than two solution exists. 5
25, 8, 47, 71, 46, 91, 158, 102, 278, 294, 216, 201, 355, 110, 297, 283, 161, 567, 490, 422, 578, 250, 309, 625, 344, 578, 287, 151, 164, 641, 736, 238, 474, 763, 408, 758, 406, 650, 813, 1090, 1043, 771, 328, 699, 902, 165, 857, 1000, 553, 1148, 1434, 955 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Conjecture: no integer occurs more than three time in this sequence. Confirmed for the first 1182 terms of A014754 (primes < 100000). In this section, there are no integers which do occur thrice. Moreover, no integer is first, second, third or fourth solution for more than three primes. Confirmed for the first 2399 terms of A007522 and the first 1182 terms of A014754 (primes < 100000).

LINKS

Table of n, a(n) for n=1..52.

FORMULA

a(n) = second solution mod p of x^4 = 2, where p is the n-th prime such that x^4 = 2 has more than two solutions mod p, i.e. p is the n-th term of A014754.

EXAMPLE

a(3) = 47, since 113 is the third term of A014754, 27, 47, 66 and 86 are the solutions mod 113 of x^4 = 2 and 47 is the second one.

PROG

(PARI): a065910(m) = local(s); forprime(p = 2, m, s = []; for(x = 0, p-1, if(x^4%p == 2%p, s = concat(s, [x]))); if(matsize(s)[2]>2, print1(s[2], ", "))) a065910(3500)

CROSSREFS

Cf. A040098, A007522, A014754, A065909, A065911, A065912.

Sequence in context: A080203 A040605 A307179 * A096521 A215539 A224490

Adjacent sequences:  A065907 A065908 A065909 * A065911 A065912 A065913

KEYWORD

nonn

AUTHOR

Klaus Brockhaus, Nov 29 2001

STATUS

approved

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Last modified January 20 10:55 EST 2022. Contains 350472 sequences. (Running on oeis4.)