Numbers n such that concatenating n and the sum of factorials of the digits of n produces a square.
A108220
Numbers n such that concatenating n and the sum of factorials of the digits of n produces a square.
Terms
- a(0) =3a(1) =102a(2) =122a(3) =202a(4) =1102a(5) =15031a(6) =244134a(7) =244233a(8) =434412a(9) =495918a(10) =1267396a(11) =1300035a(12) =1324340a(13) =1635150a(14) =3442657a(15) =3878374a(16) =5064314a(17) =6175125a(18) =6181308a(19) =10320734a(20) =10560355a(21) =10586434a(22) =10730603a(23) =10804230a(24) =11544642a(25) =16224135a(26) =17523855
External references
- oeis: A108220