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A025056
a(n) = position of 3*n^2 in sequence
A025051
(numbers of form j*k + k*i + i*j, without repetitions, where 1 <= i <= j <= k).
0
1, 7, 20, 39, 64, 95, 133, 177, 227, 284, 346, 415, 489, 570, 657, 750, 849, 954, 1065, 1182, 1305, 1434, 1569, 1710, 1857, 2010, 2169, 2334, 2505, 2682, 2865, 3054, 3249, 3450, 3657, 3870, 4089, 4314, 4545, 4782, 5025, 5274, 5529, 5790, 6057, 6330, 6609, 6894
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..48.
CROSSREFS
Cf.
A025051
.
Sequence in context:
A318790
A228882
A140676
*
A038349
A360226
A100752
Adjacent sequences:
A025053
A025054
A025055
*
A025057
A025058
A025059
KEYWORD
nonn
AUTHOR
Clark Kimberling
EXTENSIONS
a(5) onward corrected and more terms from
Sean A. Irvine
, Aug 05 2019
STATUS
approved
