a(n)=a(n-1)+ p, where p is the least prime whose first digit equals the first digit of a(n-1) and p>=a(n-1).

A175523

a(n)=a(n-1)+ p, where p is the least prime whose first digit equals the first digit of a(n-1) and p>=a(n-1).

Terms

    a(0) =1a(1) =12a(2) =25a(3) =54a(4) =113a(5) =226a(6) =453a(7) =910a(8) =1821a(9) =3644a(10) =7303a(11) =14610a(12) =29231a(13) =58462a(14) =116939a(15) =233892a(16) =467803a(17) =935616a(18) =1871237a(19) =3742486a(20) =7484979a(21) =14969998a(22) =29939999a(23) =59880012a(24) =119760031a(25) =239520072a(26) =479040191a(27) =958080388a(28) =1916160779a(29) =3832321566

External references