A288985 Numbers n for which A287874(n) < n, where A287874 is the concatenation of the prime factorization, all written in binary.

117649, 177147, 531441, 823543, 1048576, 1594323, 1771561, 1953125, 2097152, 4194304, 4782969, 4826809, 5764801, 8388608, 9765625

Offset: 1

Author

M. F. Hasler, Jun 21 2017

Keywords

• nonn
• base

Comments

A287874 is the concatenation of the prime factorization (without exponents equal to 1), all written in binary (so the result has only digits 0 and 1). Here the result of this operation is considered as a decimal number. For example, the first term is 117649 because this numer is larger than the value A287874(117649) = 111110 (even when this is considered as a decimal and not binary number).

Crossrefs

Cf. A287874.

Programs

PARI

forcomposite(n=1,1e7,A287874(n)