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A348471
One half of the even numbers without middle divisors.
0
5, 7, 11, 13, 17, 19, 22, 23, 26, 29, 31, 34, 37, 38, 39, 41, 43, 46, 47, 51, 53, 57, 58, 59, 61, 62, 67, 68, 69, 71, 73, 74, 76, 79, 82, 83, 86, 87, 89, 92, 93, 94, 97, 101, 103, 106, 107, 109, 111, 113, 115, 116, 118, 122, 123, 124, 125, 127, 129, 131, 134, 137, 139, 141
OFFSET
1,1
COMMENTS
One half of the even numbers k such that the symmetric representation of sigma(k) has an even number of parts.
FORMULA
a(n) = A319802(n)/2.
CROSSREFS
First differs from A101550 at a(57).
A subsequence is A320048 from which first differs at a(51).
Sequence in context: A256387 A113909 A111906 * A101550 A320048 A246351
KEYWORD
nonn
AUTHOR
Omar E. Pol, Oct 19 2021
STATUS
approved