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A067690
gcd((2n)!+1, n!+1) when not equal to 1.
1
7, 11, 61, 19, 43, 47, 67, 79, 103, 127, 131, 163, 179, 191, 199, 227, 263, 347, 367, 383, 419, 431, 443, 479, 491, 503, 523, 563, 571, 599, 607, 619, 631, 683, 691, 727, 739, 743, 787, 823, 839, 863, 887, 947, 991, 1019, 1051, 1087, 1091, 1123, 1151
OFFSET
1,1
LINKS
MATHEMATICA
a[n_] := GCD[(2n)! + 1, n! + 1]; Select[ Table[ a[n], {n, 1, 1000}], # != 1 &] (* Jean-François Alcover, Dec 16 2011 *)
Table[GCD[(2n)!+1, n!+1], {n, 700}]/.(1->Nothing) (* Harvey P. Dale, Jan 12 2020 *)
CROSSREFS
Sequence in context: A263231 A077411 A085016 * A358585 A196181 A177182
KEYWORD
nonn,nice
AUTHOR
Benoit Cloitre, Feb 04 2002
STATUS
approved