Geodesic
On the Divisibility of the Class Numbers of Q(√−p) and Q(√−2p) by 16.
Canadian mathematical bulletin, Tome 25 (1982) no. 2, pp. 200-206

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Let h(m) denote the class number of the quadratic field Q(√m). In this paper necessary and sufficient conditions for h (m) to be divisible by 16 are determined when m = −p, where p is a prime congruent to 1 modulo 8, and when m = −2p, where p is a prime congruent to ±1 modulo 8.
DOI : 10.4153/CMB-1982-027-0
Mots-clés : 12A25, 12A50, Key words, and phrases, class number, imaginary quadratic field, binary quadratic forms 
Leonard, Philip A.; Williams, Kenneth S. On the Divisibility of the Class Numbers of Q(√−p) and Q(√−2p) by 16.. Canadian mathematical bulletin, Tome 25 (1982) no. 2, pp. 200-206. doi: 10.4153/CMB-1982-027-0
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     title = {On the {Divisibility} of the {Class} {Numbers} of {Q(\ensuremath{\sqrt{}}\ensuremath{-}p)} and {Q(\ensuremath{\sqrt{}}\ensuremath{-}2p)} by 16.},
     journal = {Canadian mathematical bulletin},
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