A056111 Highest proper factor of n!+1.

1, 1, 1, 1, 5, 11, 103, 71, 661, 19099, 329891, 1, 36846277, 75024347, 3790360487, 22163972339, 1230752346353, 538105034941, 336967037143579, 1713311273363831, 117876683047, 1188161445853707907, 48869596859895986087, 550042909337978226383, 765041185860961084291

Offset: 0

Author

Henry Bottomley, Jun 12 2000

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 0..139
• Hisanori Mishima, Factorizations of many number sequences
• Hisanori Mishima, Factorizations of many number sequences
• R. G. Wilson v, Explicit factorizations

Crossrefs

Cf. A002583, A038507, A051301, A056110.

Programs

Mathematica

a[n_] := Divisors[n!+1][[ -2]]

Formula

a(n) = A038507(n)/A051301(n).

Extensions

Corrected and extended by Dean Hickerson, Aug 30 2001

More terms from Amiram Eldar, Oct 07 2019