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A098376 Right edge T(n,0) of the triangle A097883. 1
1, 2, 5, 6, 13, 14, 27, 26, 43, 36, 65, 62, 87, 80, 117, 110, 147, 146, 185, 168, 221, 210, 271, 258, 323, 308, 369, 368, 427, 414, 491, 476, 555, 544, 621, 610, 687, 682, 765, 764, 853, 828, 937, 918, 1027, 1010, 1113, 1102, 1209, 1198, 1305, 1304, 1415, 1398 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..53.

FORMULA

a(n) = A097883(t+1) where t is a triangular number.

MATHEMATICA

a[0, 0] = 1; a[m_, n_] := a[m, n] = Block[{p = Sort[ Flatten[ Join[ Table[ a[i, j], {i, 0, m - 1}, {j, 0, i}], Table[ a[i, j], {i, m, m}, {j, 0, n - 1}]] ]]}, k = Complement[ Range[ p[[ -1]] + 1], p][[1]]; While[ Position[p, k] != {} || If[n == 0, GCD[k, a[m - 1, 0]] != 1, If[n == m, GCD[k, a[m - 1, m - 1]] != 1, GCD[k, a[m - 1, n]] != 1 || GCD[k, a[m - 1, n - 1]] != 1]], k++ ]; k]; Table[ a[m, 0], {m, 0, 53}]

CROSSREFS

Cf. A097883, A098377.

Sequence in context: A070911 A276082 A113240 * A028259 A283684 A323348

Adjacent sequences:  A098373 A098374 A098375 * A098377 A098378 A098379

KEYWORD

nonn

AUTHOR

Leroy Quet and Robert G. Wilson v, Sep 04 2004

STATUS

approved

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Last modified March 19 13:34 EDT 2019. Contains 321330 sequences. (Running on oeis4.)