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A189828
Numbers n for which d(n-1) + d(n+1) is a record, where d(k) is the number of divisors of k.
3
2, 3, 5, 7, 11, 17, 19, 29, 41, 71, 161, 169, 181, 239, 419, 701, 721, 881, 1079, 1681, 2159, 2519, 2521, 4031, 4159, 5039, 7561, 8399, 10081, 13441, 13859, 18721, 20161, 22679, 25199, 27719, 27721, 35281, 45361, 50399, 50401, 55439, 65519, 110879, 138599
OFFSET
1,1
COMMENTS
Many of these terms are in A090481, which restricts n to be prime. The record values are in A189829.
LINKS
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Apr 28 2011
STATUS
approved