A379114 Numbers k for which A379113(k) > 1, i.e., k that have a proper unitary divisor d > 1 such that A048720(A065621(sigma(d)),sigma(k/d)) is equal to sigma(k).

6, 10, 12, 14, 15, 20, 21, 22, 24, 26, 28, 30, 33, 35, 39, 40, 42, 44, 46, 48, 50, 51, 52, 55, 56, 57, 58, 60, 62, 63, 65, 66, 69, 70, 72, 75, 76, 77, 78, 80, 84, 86, 87, 88, 91, 92, 93, 94, 96, 100, 102, 104, 105, 108, 111, 112, 114, 115, 116, 118, 119, 120, 122, 123, 124, 126, 129, 132, 133, 136, 138, 140, 141, 143, 144

Offset

1,1

Links

Antti Karttunen, Table of n, a(n) for n = 1..20000

Index entries for sequences defined by congruent products between domains N and GF(2)[X].

Index entries for sequences related to polynomials in ring GF(2)[X].

Index entries for sequences related to sigma(n).

Prog

(PARI) is_A379114(n) = (A379113(n)>1);

Crossrefs

Positions of terms > 1 in A379113.

Cf. A000396 (subsequence, at least the even terms are), A379118 (characteristic function).

Cf. also A325638, A325639 (not subsequences).

Sequence in context: A362980 A097318 A080363 * A289558 A082300 A050703

Adjacent sequences: A379111 A379112 A379113 * A379115 A379116 A379117

Keyword

nonn

Author

Antti Karttunen, Dec 17 2024

Status

approved