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A354106
Numbers k for which A354102(k) = A354102(sigma(k)).
6
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.
PROG
(PARI)
\\ Needs also the program from A267099:
A354102(n) = eulerphi(A267099(n));
isA354106(k) = (A354102(k)==A354102(sigma(k)));
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 18 2022
STATUS
approved