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4, 12, 8, 20, 12, 40, 28, 60, 48, 80, 72, 20, 60, 112, 88, 140, 132, 52, 180, 168, 28, 60, 208, 120, 32, 260, 252, 160, 68, 312, 308, 288, 180, 272, 252, 340, 228, 40, 120, 420, 408, 280, 168, 380, 220, 440, 420, 532, 520, 48, 368, 240, 612, 608, 200, 572, 300, 552, 52, 260
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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Table of n, a(n) for n=0..59.
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EXAMPLE
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The following table shows the relationship
between several closely related sequences:
Here p = A002144 = primes == 1 mod 4, p = a^2+b^2 with a < b;
a = A002331, b = A002330, t_1 = ab/2 = A070151;
p^2 = c^2+d^2 with c < d; c = A002366, d = A002365,
t_2 = 2ab = A145046, t_3 = b^2-a^2 = A070079,
with {c,d} = {t_2, t_3}, t_4 = cd/2 = ab(b^2-a^2).
---------------------------------
.p..a..b..t_1..c...d.t_2.t_3..t_4
---------------------------------
.5..1..2...1...3...4...4...3....6
13..2..3...3...5..12..12...5...30
17..1..4...2...8..15...8..15...60
29..2..5...5..20..21..20..21..210
37..1..6...3..12..35..12..35..210
41..4..5..10...9..40..40...9..180
53..2..7...7..28..45..28..45..630
.................................
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CROSSREFS
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4 times A070151, or (apart from initial term) twice A145019.
Cf. A070079.
Sequence in context: A335914 A331054 A310569 * A205849 A208855 A252984
Adjacent sequences: A145043 A145044 A145045 * A145047 A145048 A145049
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Feb 25 2009
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STATUS
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approved
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