A354106 Numbers k for which A354102(k) = A354102(sigma(k)).

1, 24, 2475, 2520, 2728, 5347, 6683, 8184, 8307, 8568, 9108, 9306, 10106, 11484, 12974, 16041, 17892, 20049, 23265, 25265, 26199, 30318, 32256, 32435, 38922, 39618, 40918, 44010, 44576, 44872, 50976, 55224, 55720, 56516, 58817, 63720, 63952, 64890, 65689, 66528, 67356, 69860, 72072, 73409, 74448, 75795, 79101, 83160

Offset

1,2

Comments

No common terms with A006872 in range a(2) .. a(1001).

Among the 1001 initial terms, only 3119744 and 13890816 occur also in A191217.

Links

Antti Karttunen, Table of n, a(n) for n = 1..1001

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

Index entries for sequences related to sigma(n)

Prog

(PARI)
\\ Needs also the program from A267099:
A354102(n) = eulerphi(A267099(n));
isA354106(k) = (A354102(k)==A354102(sigma(k)));

Crossrefs

Cf. A000010, A000203, A354102.

Cf. also A006872, A191217, A354189, A354362.

Sequence in context: A107675 A173115 A202927 * A336864 A008977 A159392

Adjacent sequences: A354103 A354104 A354105 * A354107 A354108 A354109

Keyword

nonn

Author

Antti Karttunen, May 18 2022

Status

approved