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A278484 Main diagonal of A278482. 3
0, 2, 6, 12, 18, 26, 38, 48, 62, 78, 90, 108, 132, 146, 180, 206, 222, 252, 288, 306, 348, 386, 398, 458, 480, 528, 566, 612, 648, 708, 762, 806, 842, 926, 948, 1008, 1092, 1110, 1188, 1260, 1320, 1358, 1470, 1482, 1578, 1692, 1718, 1806, 1898, 1932, 2022, 2160, 2186, 2268, 2366, 2478, 2532, 2702, 2738, 2798, 2966, 3018 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..10000

D. Wilson et al., Interesting sequence, SeqFan list, Nov. 2016

Index entries for sequences generated by sieves

FORMULA

By definition, a(n) = A278482(n,n).

a(n) = A000960(n + 1) - 1.

a(n) = 2*A073359(n). [Observed by Arie Groeneveld on SeqFan list, Nov 22 2016.] [Conjectural, true for n <= 2000 David W. Wilson, Nov 23 2016]

MATHEMATICA

a[n_]:= Fold[Floor@Times@##&, Prepend[Table[(k + 1)/k, {k, n, 1, -1}], n]] (* Ethan Beihl, Nov 29 2016 *)

CROSSREFS

Cf. A000960, A073359.

Main diagonal of A278482 (and A278483).

Sequence in context: A108585 A294062 A193764 * A159793 A238739 A006511

Adjacent sequences:  A278481 A278482 A278483 * A278485 A278486 A278487

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 23 2016 after David W. Wilson's posting on SeqFan list Nov 22 2016

STATUS

approved

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Last modified February 20 13:33 EST 2019. Contains 320327 sequences. (Running on oeis4.)