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A359125
Largest prime factor of A359124(n).
2
2, 13, 31, 19, 6173, 123457, 154321, 333667, 333667, 3388877, 4281283, 2630197, 26798700427, 8663199947, 2523244037, 12873492085621702963, 32929947197382727, 17539959825403, 71595329159622797, 325339942922532262019, 9999103057380477280607, 17465868005034957301, 1423364280511
OFFSET
1,1
COMMENTS
Has the same relation to A359124 as A075032 does to A007908. Suggested by A069048.
MATHEMATICA
FactorInteger[#][[-1, 1]]&/@Table[FromDigits[Flatten[IntegerDigits/@Range[n]]]+1, {n, 30}] (* Harvey P. Dale, Dec 20 2022 *)
PROG
(Python)
from sympy import factorint
def a(n): return max(factorint(int("".join(map(str, range(1, n+1)))) + 1))
print([a(n) for n in range(1, 24)]) # Michael S. Branicky, Dec 20 2022
CROSSREFS
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Dec 20 2022
STATUS
approved