human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "analysis of prime reciprocal sequences in base 10"
  Abstract: Prime reciprocals have applications in coding and cryptography and for generation of random sequences. This paper investigates the structural redundancy of prime reciprocals in base 10 in a manner that parallels an earlier study for binary prime reciprocals. Several different kinds of structural relationships amongst the digits in reciprocal sequences are classified with respect to the digit in the least significant place of the prime. It is also shown that the frequency of digit 0 exceeds that of every other digit when the entire set of prime reciprocal sequences is considered.

Connected through hyperedge HE-1 (induced by source paper "random sequences from primitive pythagorean triples"):
  with members:
    - "random sequences based on the divisor pairs function"
    - "goldbach circles and balloons and their cross correlation"
    - "new results on scrambling using the mesh array"
    - "on the mesh array for matrix multiplication"
    - "pythagorean triples and cryptographic coding"

Connected through hyperedge HE-2 (induced by source paper "goldbach circles and balloons and their cross correlation"):
  with members:
    - "on randomness of goldbach sequences"
    - "goldbach ellipse sequences for cryptographic applications"
    - "goldbach triples and key distribution"
    - "pythagorean triples and cryptographic coding"

Connected through hyperedge HE-3 (induced by source paper "goldbach triples and key distribution"):
  with members:
    - "on randomness of goldbach sequences"
    - "goldbach ellipse sequences for cryptographic applications"
    - "on the mesh array for matrix multiplication"
    - "pythagorean triples and cryptographic coding"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.CR(Cryptography and Security)