Being a genealogy buff, I just looked up Jean Paul Ludwig on Ancestry.com. In the Social Security Death Index there, he is listed as just “Jean Ludwig”, born 17 Feb 1890, registered for Social Security in 1951 in Connecticut, died in Jun 1981. It gives his SS# as 045-26-8722. It doesn’t state that he DIED in Honolulu, just that that was his last residence and that’s where the benefits were sent.
You mentioned that he had 2 SS#’s, so the one I found must be the other one. He is also listed on Ancestry.com (as Jean Paul Ludwig) in the California Death Index, born 17 Feb 1890 outside the US, mother’s maiden name Salome, died 19 Jun 1981 in San Luis Obispo, CA. This record also gives his SS# as 045-26-8722.
His passenger ship record on the SS Leviathan, arriving in New York 26 Sep 1927, shows he was born at Ammersville, France, was a valet, and lived in Pittsburgh. An interesting tidbit is that his employer was “Senator Reed, 1706 18th St., Washington, D.C.” A 1924 ship record also shows him working for Senator Reed.
His WWII registration card from 1942 (under John Paul Ludwig) shows him living in New Canaan, Connecticut with someone named Florence Ludwig.
A family tree at the same site shows that he married a woman named Louise and that they have a living child (name not given). There was a John Paul Ludwig born in 1938 living in Honolulu in 1992 according to the US Public Records Index at Ancestry.com.
Anyway, I didn’t find a record for him that showed a SS# beginning with 042, but that doesn’t mean there isn’t one. But maybe this gives people researching this more to go on!