OFFSET
1,1
COMMENTS
Primes p in A022012 belong to either 17 or 167 (mod 210).
Therefore a(n) is either congruent to the product of residues {17, 19, 23, 29, 31, 37, 41, 43} (mod 210), or {167, 169, 173, 179, 181, 187, 191, 193} (mod 210), so a(n) is congruent to 121 (mod 210).
Gaps between prime factors have a symmetric arrangement {2, 4, 6, 2, 6, 4, 2}.
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
MATHEMATICA
Map[Times @@ NextPrime[#, Range[0, 7]] &, Import["https://oeis.org/A022012/b022012.txt", "Data"][[;; 12, -1]]]
CROSSREFS
KEYWORD
nonn
AUTHOR
Michael De Vlieger, Aug 24 2024
STATUS
approved