Number of primes less than 10^n with digits in nonincreasing order.

Terms

a(0) =0a(1) =4a(2) =14a(3) =49a(4) =125a(5) =296a(6) =646a(7) =1304a(8) =2459a(9) =4543a(10) =7882a(11) =13272a(12) =21856a(13) =34934a(14) =53446a(15) =82055a(16) =121322a(17) =175498a(18) =251714a(19) =354810a(20) =488440a(21) =676065a(22) =914834a(23) =1220629a(24) =1627770a(25) =2135954a(26) =2759889a(27) =3590609a(28) =4602572a(29) =5830588