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

0,5

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

Formula

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

Mathematica

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

Crossrefs

Cf. A002583, A038507, A051301, A056110.

Sequence in context: A030085 A022006 A201074 * A090160 A062652 A075706

Adjacent sequences: A056108 A056109 A056110 * A056112 A056113 A056114

Keyword

nonn

Author

Henry Bottomley, Jun 12 2000

Extensions

Corrected and extended by Dean Hickerson, Aug 30 2001

More terms from Amiram Eldar, Oct 07 2019

Status

approved