OFFSET
1,1
COMMENTS
The corresponding numbers of divisors are 2, 4, 6, 8, 12, 16, 20, 24, 32, 48, 64, 72, 96, 120, 128, 144, 160, 192, 240, 256, 288, ...
EXAMPLE
2 is a term since (2, 3) is the first pair of consecutive numbers with the same number of divisors: d(2) = d(3) = 2.
14 is a term since d(14) = d(15) = 4 > d(2) = 2.
44 is a term since d(44) = d(45) = 6 > d(14) = 4.
MATHEMATICA
seq = {}; dmax = 0; d1 = 1; Do[If[d1 == (d2 = DivisorSigma[0, n]) && d1 > dmax, dmax = d1; AppendTo[seq, n-1]]; d1 = d2, {n, 2, 10^4}]; seq
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Amiram Eldar, Mar 06 2020
STATUS
approved