A139092 -id:A139092 - cp's OEIS frontend

A139089 a(n) = prime(n)!/9 + 1.

561, 4435201, 691891201, 39520825344001, 13516122267648001, 2872446304320552960001, 982417999304411328282624000001, 913648739353102535302840320000001

Offset: 4

Artur Jasinski, Apr 08 2008

nonn

Cf. A082672, A089085, A089130, A117141, A007749, A139056-A139066, A020458, A139068, A137390, A139070-A139075, A136019, A136020, A136026, A136027, A139089-A139092.

Table[(Prime[n]! + 9)/9, {n, 4, 30}]
Prime[Range[4,12]]!/9+1 (* Harvey P. Dale, Aug 22 2020 *)

A139091 a(n) = largest prime divisor of the number prime(n)!/9 + 1.

Original entry on oeis.org

17, 827, 22319071, 1718296754087, 35662591735219, 477262171871, 1609727002420791262479701, 146215297537890243023, 2020914387433686758547638152441, 1073774770807266077323

Offset: 4

Artur Jasinski, Apr 08 2008

nonn

Amiram Eldar, Table of n, a(n) for n = 4..26

Cf. A082672, A089085, A089130, A117141, A007749, A139056-A139066, A020458, A139068, A137390, A139070-A139075, A136019, A136020, A136026, A136027, A139089-A139092.

a = {}; Do[w = FactorInteger[(Prime[n]! + 9)/9]; AppendTo[a, Last[w][[1]]], {n, 4, 16}]; a

A139090 a(n) = smallest prime divisor of the number prime(n)!/9 + 1.

Original entry on oeis.org

3, 31, 31, 23, 379, 83, 610301, 293, 101, 47, 281, 127, 278174297, 2971, 109, 5090615254324820333, 46411, 106087, 269, 288931, 59047158151, 120871, 373, 19140822523, 56595118147, 1708207, 331, 38749, 157, 2927, 2143

Offset: 4

Artur Jasinski, Apr 08 2008

Cf. A082672, A089085, A089130, A117141, A007749, A139056-A139066, A020458, A139068, A137390, A139070-A139075, A136019, A136020, A136026, A136027, A139089-A139092.

a = {}; Do[w = FactorInteger[(Prime[n]! + 9)/9]; AppendTo[a, First[w][[1]]], {n, 4, 16}]; a
Table[FactorInteger[p!/9+1][[1,1]],{p,Prime[Range[4,35]]}] (* Harvey P. Dale, Sep 19 2020 *)

More terms from Jon E. Schoenfield, Jul 16 2010

cp's OEIS Frontend

A139089 a(n) = prime(n)!/9 + 1.

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A139091 a(n) = largest prime divisor of the number prime(n)!/9 + 1.

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Mathematica

A139090 a(n) = smallest prime divisor of the number prime(n)!/9 + 1.

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Author

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Mathematica

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