Powerful happy numbers; if a prime p divides n then p^2 must also divide n and also n must have trajectory under iteration of sum of squares of digits map includes 1.
A140172
Powerful happy numbers; if a prime p divides n then p^2 must also divide n and also n must have trajectory under iteration of sum of squares of digits map includes 1.
Terms
- a(0) =1a(1) =32a(2) =49a(3) =100a(4) =392a(5) =784a(6) =1000a(7) =1125a(8) =1152a(9) =1323a(10) =1444a(11) =1521a(12) =3200a(13) =3364a(14) =3456a(15) =4096a(16) =4225a(17) =4356a(18) =4563a(19) =4900a(20) =7225a(21) =7744a(22) =8281a(23) =8748a(24) =9604a(25) =10000a(26) =10125a(27) =10976a(28) =11025a(29) =12167
External references
- oeis: A140172