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A072904 Nonsquares m such that the discriminant of the quadratic field Q(sqrt(m) ) < m. 1
18, 20, 27, 32, 45, 48, 50, 52, 54, 63, 68, 72, 75, 80, 84, 90, 96, 98, 99, 108, 112, 116, 117, 125, 126, 128, 132, 135, 147, 148, 150, 153, 160, 162, 164, 171, 175, 176, 180, 189, 192, 198, 200, 207, 208, 212, 216, 224, 228, 234, 240, 242, 243, 244, 245, 250 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..56.

FORMULA

a(n) appears to be asymptotic to C*n with C=3.4.....

PROG

(PARI) isok(m) = !issquare(m) && (quaddisc(m) < m); \\ Michel Marcus, Feb 18 2021

CROSSREFS

Cf. A037449.

Intersection of A000037 and A072903.

Sequence in context: A295745 A328934 A255848 * A268284 A054279 A186781

Adjacent sequences:  A072901 A072902 A072903 * A072905 A072906 A072907

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Aug 10 2002

STATUS

approved

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Last modified October 21 14:42 EDT 2021. Contains 348155 sequences. (Running on oeis4.)