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- Karl Dilcher
- Discrete Mathematics
- 1995

- Richard E. Crandall, Karl Dilcher, Carl Pomerance
- Math. Comput.
- 1997

An odd prime p is called a Wieferich prime if 2p−1 ≡ 1 (mod p); alternatively, a Wilson prime if (p− 1)! ≡ −1 (mod p). To date, the only known Wieferich primes are p = 1093 and 3511, while the only known Wilson primes are p = 5, 13, and 563. We report that there exist no new Wieferich primes p < 4×1012 , and no new Wilson primes p < 5×108. It is elementary… (More)

- Takashi Agoh, Karl Dilcher
- Discrete Mathematics
- 2009

- Karl Dilcher
- Electr. J. Comb.
- 2008

The generalized harmonic numbers H (k) n = ∑n j=1 j −k satisfy the well-known congruence H (k) p−1 ≡ 0 (mod p) for all primes p ≥ 3 and integers k ≥ 1. We derive q-analogs of this congruence for two different q-analogs of the sum H (k) n . The results can be written in terms of certain determinants of binomial coefficients which have interesting properties… (More)

- Takashi Agoh, Karl Dilcher
- The American Mathematical Monthly
- 2008

- Takashi Agoh, Karl Dilcher
- 2010

We derive several new convolution identities for the Stirling numbers of the first kind. As a consequence we obtain a new linear recurrence relation which generalizes known relations.

- Karl Dilcher
- 1998

Hypergeometric functions are an important tool in many branches of pure and applied mathematics, and they encompass most special functions, including the Chebyshev polynomials. There are also well-known connections between Chebyshev polynomials and sequences of numbers and polynomials related to Fibonacci numbers. However, to my knowledge and with one small… (More)

We show that the resultants with respect to x of certain linear forms in Chebyshev polynomials with argument x are again linear forms in Chebyshev polynomials. Their coefficients and arguments are certain rational functions of the coefficients of the original forms. We apply this to establish several related results involving resultants and discriminants of… (More)

- R. P. BRENT, K. DILCHER
- 1997

We report the discovery of new 27-decimal digit factors of the thirteenth and sixteenth Fermat numbers. Each of the new factors was found by the elliptic curve method. After division by the new factors and other known factors, the quotients are seen to be composite numbers with 2391 and 19694 decimal digits respectively.

- Karl Dilcher
- 2007

An 1876 theorem of Hermite, later extended by Bachmann, gives congruences modulo primes for lacunary sums over the rows of Pascal’s triangle. This paper gives an analogous result for alternating sums over a certain class of rows. The proof makes use of properties of certain linear recurrences.