Numbers n such that pi(n) = sigma(d_1)*sigma(d_2)*...*sigma(d_k) where d_1 d_2 ... d_k is the decimal expansion of n.

A098685

Numbers n such that pi(n) = sigma(d_1)*sigma(d_2)*...*sigma(d_k) where d_1 d_2 ... d_k is the decimal expansion of n.

Terms

    a(0) =15a(1) =155a(2) =252a(3) =916a(4) =1189a(5) =12654a(6) =55293a(7) =177554a(8) =418634a(9) =753248a(10) =885193a(11) =18252678a(12) =18252687a(13) =18469156a(14) =18469165a(15) =19882616a(16) =19882623a(17) =41867246a(18) =73526936a(19) =73526957a(20) =233843449a(21) =244895519a(22) =2345784285a(23) =2399877831a(24) =4273447776a(25) =29891923496a(26) =42649454852a(27) =728781494646

External references