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A372960
Concatenation of the exponents in the prime factorization of 2*n-1.
0
0, 1, 1, 1, 2, 1, 1, 11, 1, 1, 11, 1, 2, 3, 1, 1, 11, 11, 1, 11, 1, 1, 21, 1, 2, 11, 1, 11, 11, 1, 1, 21, 11, 1, 11, 1, 1, 12, 11, 1, 4, 1, 11, 11, 1, 11, 11, 11, 1, 21, 1, 1, 111, 1, 1, 11, 1, 11, 21, 11, 2, 11, 3, 1, 11, 1, 11, 31, 1, 1, 11, 11, 11, 12, 1, 1, 21
OFFSET
1,5
FORMULA
a(n) = A037916(2*n-1).
EXAMPLE
a(8) = 11, because 2*8 - 1 = 15 = 3^1 * 5^1 and the concatenation of the exponents of the prime factorization is 11.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Jean-Marc Rebert, Aug 02 2024
STATUS
approved