A355307 Carmichael numbers ending in 7.

46657, 126217, 748657, 1569457, 4909177, 9613297, 11972017, 40160737, 55462177, 65037817, 106041937, 161035057, 178451857, 193910977, 196358977, 311388337, 328573477, 338740417, 358940737, 403043257, 461502097, 499310197, 556450777, 569332177, 633639097, 784966297, 902645857, 981789337, 1125038377

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Index entries for sequences related to Carmichael numbers

Mathematica

Select[10*Range[0, 10^7] + 7, CompositeQ[#] && Divisible[# - 1, CarmichaelLambda[#]] &] (* Amiram Eldar, Jul 24 2022 *)

Prog

(Python)
from itertools import count, islice
from sympy import factorint
def A355307_gen(): # generator of terms
    for n in count(7, 10):
        f = factorint(n)
        if len(f) == sum(f.values()) > 1 and not any((n-1) % (p-1) for p in f):
            yield n
A355307_list = list(islice(A355307_gen(), 5)) # Chai Wah Wu, Jul 25 2022

Crossrefs

Intersection of A002997 and A017353.

Cf. A352970, A354609, A355305, A355309.

Sequence in context: A223362 A143163 A132642 * A265285 A255514 A251502

Adjacent sequences: A355304 A355305 A355306 * A355308 A355309 A355310

Keyword

nonn,base

Author

Omar E. Pol, Jul 24 2022

Status

approved