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A271326
a(n) = A269347(3n).
3
3, 15, 30, 51, 84, 111, 150, 195, 246, 318, 366, 435, 510, 591, 684, 771, 882, 975, 1086, 1218, 1326, 1455, 1590, 1731, 1884, 2031, 2190, 2370, 2526, 2718, 2886, 3075, 3270, 3483, 3684, 3891, 4128, 4335, 4566, 4818, 5046, 5295, 5550, 5811, 6084
OFFSET
1,1
COMMENTS
This sequence represents the "peaks" of A269347(n), which occur for that sequence when n is divisible by 3.
Terms of this sequence are equal to 3n^2 + 3 with predictable frequency; see my comment on A271328.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alec Jones, Apr 04 2016
STATUS
approved