

A334027


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


0



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
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..61.
Eric Weisstein's World of Mathematics, Look and Say Sequence
Wikipedia, Lookandsay sequence


FORMULA

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


EXAMPLE

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.


CROSSREFS

Cf. A037916, A045918.
Sequence in context: A065016 A087381 A136400 * A121266 A045988 A008947
Adjacent sequences: A334024 A334025 A334026 * A334028 A334029 A334030


KEYWORD

nonn,base


AUTHOR

Wesley Ivan Hurt, Apr 12 2020


STATUS

approved



