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A286148 Triangle A286146 reversed. 2
1, 5, 2, 13, 16, 4, 25, 67, 12, 7, 41, 191, 106, 46, 11, 61, 436, 80, 31, 23, 16, 85, 862, 596, 379, 211, 92, 22, 113, 1541, 302, 781, 59, 277, 38, 29, 145, 2557, 1954, 193, 991, 631, 58, 154, 37, 181, 4006, 822, 2416, 467, 96, 212, 436, 57, 46, 221, 5996, 4852, 3829, 2927, 2146, 1486, 947, 529, 232, 56, 265, 8647, 1832, 706, 355, 3487, 142, 1771, 109, 94, 80, 67 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A286146, A286101.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10585; the first 145 rows of triangle

EXAMPLE

The first twelve rows of the triangle:

    1,

    5,    2,

   13,   16,    4,

   25,   67,   12,    7,

   41,  191,  106,   46,   11,

   61,  436,   80,   31,   23,   16,

   85,  862,  596,  379,  211,   92,   22,

  113, 1541,  302,  781,   59,  277,   38,   29,

  145, 2557, 1954,  193,  991,  631,   58,  154,  37,

  181, 4006,  822, 2416,  467,   96,  212,  436,  57,  46,

  221, 5996, 4852, 3829, 2927, 2146, 1486,  947, 529, 232, 56,

  265, 8647, 1832,  706,  355, 3487,  142, 1771, 109,  94, 80, 67

PROG

(Scheme) (define (A286148 n) (A286101bi (A002024 n) (A004736 n))) ;; For A286101bi see A286101.

(Python)

from sympy import lcm, gcd

def t(n, k): return (2 + ((gcd(n, k) + lcm(n, k))**2) - gcd(n, k) - 3*lcm(n, k))/2

for n in range(1, 21): print [t(n, k) for k in range(1, n + 1)][::-1] # Indranil Ghosh, May 11 2017

CROSSREFS

Cf. A286101.

Cf. A286146 (same triangle reversed).

Sequence in context: A330613 A085436 A277710 * A194048 A158868 A104634

Adjacent sequences:  A286145 A286146 A286147 * A286149 A286150 A286151

KEYWORD

nonn,tabl

AUTHOR

Antti Karttunen, May 06 2017

STATUS

approved

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Last modified March 7 10:30 EST 2021. Contains 341869 sequences. (Running on oeis4.)