login
A301523
Integers which can be partitioned into two distinct factorials. 0! and 1! are not considered distinct.
2
3, 7, 8, 25, 26, 30, 121, 122, 126, 144, 721, 722, 726, 744, 840, 5041, 5042, 5046, 5064, 5160, 5760, 40321, 40322, 40326, 40344, 40440, 41040, 45360, 362881, 362882, 362886, 362904, 363000, 363600, 367920, 403200, 3628801, 3628802, 3628806, 3628824, 3628920, 3629520, 3633840, 3669120, 3991680
OFFSET
1,1
COMMENTS
Numbers of the form i! + j! where i > j > 0. - Altug Alkan, Mar 23 2018
Primes in this sequence are A088332(n) for n > 1.
LINKS
EXAMPLE
+ | 1 2 6 24
----+--------------------
1 |
2 | 3;
6 | 7, 8;
24 | 25, 26, 30;
120 | 121, 122, 126, 144;
MATHEMATICA
Union[Total/@Subsets[Range[10]!, {2}]] (* Harvey P. Dale, Aug 25 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Mar 23 2018
STATUS
approved