A177512 - OEIS

A177512

A053735-deficient numbers.

1, 2, 5, 7, 11, 13, 17, 19, 23, 25, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 121, 127, 131, 137, 139, 149, 151, 157, 163, 167, 169, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251

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OFFSET

1,2

COMMENTS

For definition, see A175522.

All primes, except for 3, are in the sequence.

It also contains squared primes p^2 for p = 5, 7, 11, 13, 19, 23, 29, 31, 37.. (not matching current OEIS sequences). What characterizes these p?

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

{n: sum_{d|n, d<n} A053735(d) < A053735(n)}.

PROG