A348471 - OEIS

A348471

One half of the even numbers without middle divisors.

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

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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.

LINKS

Table of n, a(n) for n=1..64.

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).