A002982 - OEIS

The sequence of numbers n! - 1 together with their prime indices begins:

1: {}

5: {3}

23: {9}

119: {4,7}

719: {128}

5039: {675}

40319: {9,273}

362879: {5,5,430}

3628799: {10,11746}

39916799: {6,7,9,992}

479001599: {25306287}

6227020799: {270,256263}

87178291199: {3610490805}

1307674367999: {7,11,11,16,114905}

20922789887999: {436,318519035}

355687428095999: {8,21,10165484947}

6402373705727999: {17,20157,25293727}

121645100408831999: {119,175195,4567455}

2432902008176639999: {11715,659539127675}

(End)