Infinitely Many Ramanujan-type Congruences for p_{4,1}(n) mod 7 - Sayan Kumar Mitra Class 11 Rajendra Vidyalaya Jamshedpur
Year: 2026
Type: preprint
Abstract: Author: Sayan Kumar Mitra, Class 11, Rajendra Vidyalaya, Jamshedpur, Jharkhand, India. Independent Researcher in Number Theory. TITLE: Infinitely Many Ramanujan-type Congruences for p_{4,1}(n) modulo 7 ABSTRACT: Let p_{4,1}(n) denote the number of partitions of n where parts ≡ ±1 mod 4 are distinct and counted with specific weights. In this paper, I proved that there are infinitely many n such that p_{4,1}(n) ≡ 0 mod 7. The proof uses the theory of modular forms modulo 7. I show that the generating function G(q) for p_{4,1}(n) is congruent modulo 7 to a product H(q) = ∏_{m≥1} 1/(1 - q^{m}) with modifications, which exhibits modular properties. This is related to Ramanujan's famous partition congruences p(5n+4) ≡ 0 mod 5. Conjecture: There exists an infinite family of congruences of the form p_{4,1}(l^k n + δ_k) ≡ 0 mod 7 for primes l. Keywords: p41 partitions, partitions mod 7, Ramanujan congruences, Sayan Kumar Mitra, Rajendra Vidyalaya Jamshedpur, Number Theory High School Research Paper
Author: Mitra, Sayan Kumar
Language: English
Subfield: Algebra and Number Theory
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7222786456
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