what is the next term?

[f.firoozbakht at sci.ui.ac.ir]

Hi Seqfans,

17 = 1*7-th prime
73 = 7*3-th prime
2475989 = 2*4*7*5*9*8*9-th prime

17, 73, 2475989, ??

I know the next term(if there exists) is greater than
2252945251.

Please see A097220.

Note that,

  Pi(15) = 1 + 5
  Pi(27) = 2 + 7
  Pi(39) = 3 + 9

15, 27 & 39  are only such numbers.


Thanks, Farideh.



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