Numbers n such that the number of digits d in n is not prime and for each factor f of d the sum of the d/f digit groupings of size f is a square.
A258660
Numbers n such that the number of digits d in n is not prime and for each factor f of d the sum of the d/f digit groupings of size f is a square.
Terms
- a(0) =1a(1) =4a(2) =9a(3) =1521a(4) =3600a(5) =7396a(6) =8100a(7) =103041a(8) =120409a(9) =160801a(10) =11471769a(11) =11655396a(12) =12802084a(13) =15210000a(14) =22724289a(15) =36000000a(16) =42889401a(17) =42928704a(18) =45481536a(19) =45968400a(20) =46009089a(21) =54567769a(22) =61811044a(23) =62236321a(24) =70006689a(25) =73925604a(26) =73960000a(27) =76965529a(28) =79174404a(29) =81000000
External references
- oeis: A258660