A334027 "Look and say" the concatenated exponents in the prime factorization of n.

10, 11, 11, 12, 11, 21, 11, 13, 12, 21, 11, 1211, 11, 21, 21, 14, 11, 1112, 11, 1211, 21, 21, 11, 1311, 12, 21, 13, 1211, 11, 31, 11, 15, 21, 21, 21, 22, 11, 21, 21, 1311, 11, 31, 11, 1211, 1211, 21, 11, 1411, 12, 1112, 21, 1211, 11, 1113, 21, 1311, 21, 21, 11, 1221, 11

Offset: 1

Author

Wesley Ivan Hurt, Apr 12 2020

Keywords

• nonn
• base

Examples

			2 = 2^1 and there is one 1, so a(2) = 11.
3 = 3^1 and there is one 1, so a(3) = 11.
4 = 2^2 and there is one 2, so a(4) = 12.
5 = 5^1 and there is one 1, so a(5) = 11.
6 = 2^1*3^1 and there are two 1's, so a(6) = 21.
7 = 7^1 and there is one 1, so a(7) = 11.
8 = 2^3 and there is one 3, so a(8) = 13.
9 = 3^2 and there is one 2, so a(9) = 12.
10 = 2^1*5^1 and there are two 1's, so a(10) = 21.
		

Links

• Eric Weisstein's World of Mathematics, Look and Say Sequence
• Wikipedia, Look-and-say sequence

Crossrefs

Cf. A037916, A045918.

Formula

a(n) = A045918(A037916(n)).