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A222311 Leading diagonal of triangle in A222310. 4
1, 2, 3, 6, 5, 15, 105, 70, 1, 5, 33, 55, 65, 273, 1001, 1430, 17, 17, 969, 4845, 1785, 6545, 37145, 81719, 17, 1105, 3553, 969969, 672945, 81345, 955049953, 66786710, 33, 561, 385, 6545, 6105, 657305, 15873, 8544965, 1353, 268345, 61705, 329681, 650793, 24173705985, 3065857, 250538768183, 561, 33, 21945 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A222313 for the numbers that appear in this sequence.

LINKS

N. J. A. Sloane, Table of n, a(n) for n = 1..500

C. Cobeli and A. Zaharescu, Promenade around Pascal Triangle-Number Motives, Bull. Math. Soc. Sci. Math. Roumanie, Tome 56(104) No. 1, 2013, 73-98.

Cristian Cobeli, Alexandru Zaharescu, A game with divisors and absolute differences of exponents, arXiv:1411.1334 [math.NT], 2014 (see page 12).

Cristian Cobeli, Mihai Prunescu, Alexandru Zaharescu, A growth model based on the arithmetic Z-game, arXiv:1511.04315 [math.NT], 2015.

MATHEMATICA

Join[r = {1}, Table[Reverse[r = FoldList[#1*#2/GCD[#1, #2]^2&, n, r]], {n, 2, 100}][[All, 1]]] (* Jean-Fran├žois Alcover, Sep 04 2018, after Ivan Neretin in A222310 *)

CROSSREFS

Cf. A222310, A222313.

Sequence in context: A255483 A098012 A066117 * A156833 A319344 A260443

Adjacent sequences:  A222308 A222309 A222310 * A222312 A222313 A222314

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 16 2013

STATUS

approved

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Last modified October 19 13:01 EDT 2019. Contains 328222 sequences. (Running on oeis4.)