The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #18 Jul 26 2022 13:38:53
%S 52633,63973,334153,670033,997633,2508013,2628073,5968873,6733693,
%T 13696033,15829633,15888313,18900973,26280073,27336673,46483633,
%U 53711113,65241793,67653433,75765313,124630273,133344793,158864833,182356993,227752993,242641153,292244833,426821473,577240273,580565233,600892993
%N Carmichael numbers ending in 3.
%H Amiram Eldar, <a href="/A355309/b355309.txt">Table of n, a(n) for n = 1..10000</a>
%H <a href="/index/Ca#Carmichael">Index entries for sequences related to Carmichael numbers</a>
%t Select[10*Range[0, 10^7] + 3, CompositeQ[#] && Divisible[# - 1, CarmichaelLambda[#]] &] (* _Amiram Eldar_, Jul 25 2022 *)
%o (Python)
%o from itertools import count, islice
%o from sympy import factorint
%o def A355309_gen(): # generator of terms
%o for n in count(3,10):
%o f = factorint(n)
%o if len(f) == sum(f.values()) > 1 and not any((n-1) % (p-1) for p in f):
%o yield n
%o A355309_list = list(islice(A355309_gen(),5)) # _Chai Wah Wu_, Jul 26 2022
%Y Intersection of A002997 and A017305.
%Y Cf. A352970, A354609, A355305, A355307.
%K nonn,base
%O 1,1
%A _Omar E. Pol_, Jul 25 2022