

A055553


Number of Carmichael numbers (A002997) less than 10^n.


61



0, 0, 1, 7, 16, 43, 105, 255, 646, 1547, 3605, 8241, 19279, 44706, 105212, 246683, 585355, 1401644, 3381806, 8220777, 20138200
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OFFSET

1,4


COMMENTS

There is still no agreement about the value of a(22), so a(22) has not been entered here yet. The latest email from Amiram Eldar (Jul 17 2024) that I received said: "There is a new version of Shallue and Webster's preprint (https://arxiv.org/abs/2401.14495) with a corrected value: 49679873 instead of 49483968. It is still different from Goutier's value (49679870), higher by merely 3. The check that I did on his list verified all of them, but could not rule out missing terms."


REFERENCES

Richard Pinch, Carmichael Numbers up to 10^20, ANTS 7.


LINKS



CROSSREFS



KEYWORD

nonn,more,changed


AUTHOR



EXTENSIONS

a(22) from Shallue and Webster (2024) added by Amiram Eldar, Feb 23 2024


STATUS

approved



