A140174 Numbers k such that k = pi(k)*(sum of the digits of k).

0, 2, 30, 1122, 24300

Offset: 1

Author

Farideh Firoozbakht, May 15 2008

Keywords

• base
• more
• nonn

Comments

This sequence is a subsequence of A057809. There is no further term up to 16*10^6.

a(6) > 1.4*10^22, if it exists. - Giovanni Resta, Aug 31 2018

Examples

			24300 = pi(24300) * (2+4+3+0+0) = 2700 * 9.
		

Crossrefs

Cf. A000720, A007953, A057809, A140173.

Programs

Mathematica

Select[Range[0,25000],PrimePi[#]Total[IntegerDigits[#]]==#&] (* Harvey P. Dale, Feb 13 2023 *)