Let P(i) = i-th prime. To get a(n), factor P(n)-1 as a product of primes, then concatenate the exponents.

A097463

Let P(i) = i-th prime. To get a(n), factor P(n)-1 as a product of primes, then concatenate the exponents.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =11a(4) =101a(5) =21a(6) =4a(7) =12a(8) =10001a(9) =2001a(10) =111a(11) =22a(12) =301a(13) =1101a(14) =100000001a(15) =200001a(16) =1000000001a(17) =211a(18) =11001a(19) =1011a(20) =32a(21) =110001a(23) =30001a(24) =51a(25) =202a(26) =1100001a(28) =23a(29) =4001a(30) =1201a(31) =101001

External references