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A190815 A bisection of A049690. 3
0, 3, 9, 17, 31, 45, 63, 87, 111, 139, 173, 205, 243, 287, 329, 373, 435, 487, 535, 607, 663, 727, 809, 877, 955, 1037, 1117, 1205, 1293, 1385, 1475, 1595, 1695, 1783, 1913, 2005, 2123, 2267, 2379, 2487, 2629, 2763, 2893, 3041, 3177, 3313, 3473, 3625, 3761 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 1..10000

MAPLE

A190815 := proc(n) option remember: if(n=1)then return 0:fi: return procname(n-1)+numtheory[phi](4*n-6)+numtheory[phi](4*n-4): end: seq(A190815(n), n=1..49); # Nathaniel Johnston, May 24 2011

CROSSREFS

Cf. A049690, A099958.

Sequence in context: A171152 A035107 A090262 * A006459 A049778 A270105

Adjacent sequences:  A190812 A190813 A190814 * A190816 A190817 A190818

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, May 20 2011

EXTENSIONS

More terms from Nathaniel Johnston, May 24 2011

STATUS

approved

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Last modified November 24 04:08 EST 2020. Contains 338607 sequences. (Running on oeis4.)