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We have the following indirect implication of form equivalence classes:

25 \(\Rightarrow\) 104 given by the following sequence of implications, with a reference to its direct proof:

Implication	Reference
25 \(\Rightarrow\) 34	clear
34 \(\Rightarrow\) 104	clear

Here are the links and statements of the form equivalence classes referenced above:

Howard-Rubin Number	Statement
25:	\(\aleph _{\beta +1}\) is regular for all ordinals \(\beta\).
34:	\(\aleph_{1}\) is regular.
104:	There is a regular uncountable aleph. Jech [1966b], p 165 prob 11.26.

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