A058040 - OEIS

A058040

Numbers k such that if p_1,p_2,...,p_m, m>1, are the prime factors of k, then there is some b>0 such that k = Sum_{i=1..m} b^(p_i).

12, 36, 576, 16464

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OFFSET

1,1

COMMENTS

No others < 1000000.

No others <= 10^9. - Sean A. Irvine, Jul 19 2022

LINKS

EXAMPLE

12=2^2*3=2^2+2^3 (b=2);

36=2^2*3^2=3^2+3^3 (b=3);

576=2^6*3^2=8^2+8^3 (b=8);

16464=2^4*3*7^3=4^2+4^3+4^7 (b=4).

CROSSREFS

KEYWORD

nonn

AUTHOR

EXTENSIONS

Offset corrected and title clarified by Sean A. Irvine, Jul 19 2022

STATUS

approved