OFFSET
1,1
COMMENTS
Numbers n=abcde... that can be written as n = a*b^c*d^e..., where the last operation can be either a multiplication or an exponentiation. Cf. with A096298 where the first operation is an exponentiation. The expressions, up to 10^10, are 1*7^04*71, 1*7^4*0725, 1*07^4*4475, 5*25^2*1^8*7^5, 58*2^10*099^2, 89*6^9*1^4944, 90*6^9*9264^0, 101*07^4*4168, 1*33^4*1^6*1125, 3368*63^3*1^8*4, 3*6^7*3^3*2^01*9^2, 4*2^5*1^1*5763^2, 443*7^5*1^8*596.
EXAMPLE
896914944 = 89*6^9*1^4944.
CROSSREFS
KEYWORD
base,hard,more,nonn
AUTHOR
Giovanni Resta, Feb 27 2006
STATUS
approved