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A099072 First differences of A000960, divided by 2. 0
1, 2, 3, 3, 4, 6, 5, 7, 8, 6, 9, 12, 7, 17, 13, 8, 15, 18, 9, 21, 19, 6, 30, 11, 24, 19, 23, 18, 30, 27, 22, 18, 42, 11, 30, 42, 9, 39, 36, 30, 19, 56, 6, 48, 57, 13, 44, 46, 17, 45, 69, 13, 41, 49, 56, 27, 85, 18, 30, 84, 26, 64, 26, 64, 47, 54, 45, 94, 17, 36, 85, 60, 23, 79, 98 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..75.

MATHEMATICA

del[lst_, k_] := lst[[ Select[ Range[ Length[ lst]], Mod[ #, k] != 0 &]]]; For[ k = 2; s = Range[10000], k <= Length[s], k++, s = del[s, k]]; (Drop[s, 1] - Drop[s, -1])/2

CROSSREFS

Cf. A000960, A056526.

Sequence in context: A281365 A304705 A131187 * A257241 A239964 A290585

Adjacent sequences:  A099069 A099070 A099071 * A099073 A099074 A099075

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Nov 15 2004

EXTENSIONS

More terms from Robert G. Wilson v, Nov 15 2004

STATUS

approved

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Last modified February 21 21:36 EST 2020. Contains 332113 sequences. (Running on oeis4.)