A034131 - OEIS

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A034131

Decimal part of cube root of a(n) starts with 5: first term of runs.

4, 16, 43, 92, 167, 275, 422, 615, 858, 1158, 1521, 1954, 2461, 3049, 3724, 4493, 5360, 6332, 7415, 8616, 9939, 11391, 12978, 14707, 16582, 18610, 20797, 23150, 25673, 28373, 31256, 34329, 37596, 41064, 44739, 48628, 52735, 57067, 61630

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

FORMULA

a(n) = ceiling((n+1/2)^3). - Benoit Cloitre, Apr 16 2003

(1/8) {8n^3 + 36n^2 + 54n + 31 - (-1)^n - 2(-1)^[(n-1)/2] }. - Ralf Stephan, Jun 10 2005

CROSSREFS

Cf. A034121.

Sequence in context: A344857 A190090 A227012 * A183536 A320100 A161142

Adjacent sequences: A034128 A034129 A034130 * A034132 A034133 A034134

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Sep 15 1998

STATUS

approved