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A Local Rank Criterion for Strong Lucas Pseudoprimes and the Lucas-PSW Semiprime Family

Authors: Janik, John;

A Local Rank Criterion for Strong Lucas Pseudoprimes and the Lucas-PSW Semiprime Family

Abstract

We compute a multi-test census of small-height pseudoprimality liars, recording foreach odd composite $n$ the interval-local Miller--Rabin and Euler--Jacobi spectra$\sigmamr(n;A),\sigmaej(n;A)$, the strong-Lucas grid spectrum $\sigmasl(n;A)$ over$P\in[1,A]$, $Q\in\{\pm1\}$, and Baillie--PSW, Frobenius and extra-strong Lucasindicators. A CUDA backend (RTX~5090), verified bit-for-bit against a CPUreference, reaches $N=10^{11}$ at $A=1000$ in $68.8$ hours; it reproduces the priorrecord-holder $3215031751$, the OEIS base-2 strong-pseudoprime counts ($8607$ below$10^{11}$), and the empty Baillie--PSW survivor set below $10^{11}$. The strong-Lucas-extremal composites are essentially disjoint from the MR-extremalones (all carry $\sigmamr=0$; at $10^{11}$ the top-$100$ sets share one composite),and are dominated by the semiprime family $n=p(2p+3)$. We prove a local CRTcriterion for strong-Lucas pseudoprimality in terms of the rank of apparition (theLucas analogue of the corrected Miller--Rabin local-order criterion, independentlyverified computationally). It identifies $q=2p+3$ as the coefficient-$2$ affinefamily aligning the nonsplit $p+1$ rank with the split $q-1$ rank, sharpens in themixed character regime to an exact criterion (strong-Lucas $\iff v_2(\rho_p)=v_2(\rho_q)$), and exhibits $\sigmasl(n;A)$ as a small-height sum offixed-discriminant slices of Arnault's strong-Lucas parameter counts. The residue clustering $n\equiv77\pmod{100}$ among the strong-Lucas extremes is aselection effect of $\sigmasl$ via the character $\left(\tfrac5n\right)$ and the$p\bmod4$ structure, not a prime-pair density artifact. We give the unconditionalmechanism and a conditional average-order dominance theorem, and isolate the exactanalytic obstruction, a Bateman--Horn and $2$-adic rank-equidistributioninput, to a ranked-tail asymptotic; asymptotic claims beyond the enumerated rangeare explicitly avoided.

Keywords

computational number theory, Miller--Rabin, Carmichael number, primality testing, Monier formula

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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Average