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A075895 Rounded sum of first n odd integers squared divided by n-th prime. 1
0, 3, 7, 12, 15, 22, 27, 36, 42, 46, 57, 62, 71, 85, 96, 103, 111, 127, 136, 150, 169, 180, 195, 207, 215, 232, 255, 273, 298, 318, 313, 333, 350, 377, 384, 412, 430, 449, 474, 493, 513, 546, 555, 588, 617, 652, 656, 661, 691, 728, 759, 784, 824, 836, 863, 890, 918, 960, 989, 1025, 1069, 1084, 1086 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) is integer (presumably) only for n = 3, 4, 5, 6; corresponding values for a(n) = 7, 12, 15, 22.

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = round(n*(4n^2 - 1)/(3*prime(n))) for n>=2, a(1) = 0.

MAPLE

0, seq(round(n*(4*n^2-1)/(3*ithprime(n))), n=2..100); # Robert Israel, Jul 06 2017

CROSSREFS

Sequence in context: A310235 A310236 A296094 * A033015 A225574 A317305

Adjacent sequences:  A075892 A075893 A075894 * A075896 A075897 A075898

KEYWORD

easy,nonn

AUTHOR

Zak Seidov, Oct 17 2002

EXTENSIONS

a(44)-a(63) from Robert Israel, Jul 06 2017

STATUS

approved

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Last modified December 13 06:26 EST 2019. Contains 329968 sequences. (Running on oeis4.)