A353759 - OEIS

A353759

Numbers k for which A353749(k) <= A353749(sigma(k)), where A353749(k) = phi(k) * A064989(k), and A064989 shifts the prime factorization one step towards lower primes.

1, 2, 4, 6, 8, 9, 10, 12, 16, 18, 20, 24, 25, 28, 30, 32, 36, 40, 44, 45, 48, 49, 50, 52, 54, 56, 60, 64, 68, 72, 74, 75, 76, 80, 81, 84, 88, 90, 96, 98, 100, 104, 108, 112, 116, 117, 120, 121, 126, 128, 132, 136, 140, 144, 148, 150, 152, 156, 160, 162, 164, 168, 172, 176, 180, 192, 196, 198, 200, 204, 208, 216, 220

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OFFSET

1,2

COMMENTS

If an odd number is in the intersection of A348749 and A353684, then it is certainly included in this sequence also.

LINKS

Table of n, a(n) for n=1..73.

Index entries for sequences where odd perfect numbers must occur, if they exist at all

Index entries for sequences computed from indices in prime factorization

Index entries for sequences related to sigma(n)

PROG

(PARI)