Father James Cullen, S.J. (19 April 1867 – 7 December 1933) was born at Drogheda, County Louth,

Ireland Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...

. He was born at 89 West Street, Drogheda, to Michael Cullen, a baker, and Catherine McDonough. Initially, he was educated privately, then by the Christian Brothers,. He studied pure and applied mathematics at the Trinity College, Dublin, then at Mungret College, Limerick, before deciding to become a Jesuit. He studied in England in Mansera House, and St. Mary's, and was ordained as a priest on 31 July 1901. In 1905, he taught mathematics at Mount St. Mary's College in

Derbyshire Derbyshire ( ) is a ceremonial county in the East Midlands, England. It includes much of the Peak District National Park, the southern end of the Pennine range of hills and part of the National Forest. It borders Greater Manchester to the nor ...

and published his finding of what is now known as Cullen numbers in

number theory Number theory (or arithmetic or higher arithmetic in older usage) is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions. German mathematician Carl Friedrich Gauss (1777–1855) said, "Mat ...

. He ended up looking after accounts for the English province of the Jesuits, while contributing to mathematics journals.Fr. J. Cullen SJ - Obituary
The Tablet, 16 December 1933.

References

*Keller, Wilfrid (1995). New Cullen primes. ''Math. Comp.'' 64, 1733–1741.

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1867 births 1933 deaths 20th-century Irish Jesuits 20th-century Irish mathematicians Number theorists Alumni of Trinity College Dublin People from Drogheda Jesuit scientists Christian clergy from County Louth Scientists from County Louth {{europe-mathematician-stub

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