Least integer m > 0 with pi(m*n) = sigma(m) + sigma(n), where pi(.) and sigma(.) are given by A000720 and A000203 respectively.

A247673

Least integer m > 0 with pi(m*n) = sigma(m) + sigma(n), where pi(.) and sigma(.) are given by A000720 and A000203 respectively.

Terms

    a(0) =23a(1) =47a(2) =359a(3) =25a(4) =11a(5) =33a(6) =9a(7) =17a(8) =182a(9) =11a(10) =15a(11) =304a(12) =12a(13) =160a(14) =6105a(15) =444a(16) =22676a(17) =408a(18) =5a(19) =60a(20) =8a(21) =17888a(22) =9a(23) =125526a(24) =1616818a(25) =334976a(26) =22584a(27) =19548a(28) =10a(29) =286780

External references