OFFSET
1,1
COMMENTS
a(15) > 10^5, if it exists.
EXAMPLE
3 is a term since the third superabundant number is A004394(3) = 4 and {4-1, 4+1} = {3, 5} is a twin primes pair.
MATHEMATICA
s = {}; abm = 0; k = 0; Do[ab = DivisorSigma[-1, n]; If[ab > abm, abm = ab; k++; If[PrimeQ[n - 1] && PrimeQ[n + 1], AppendTo[s, k]]], {n, 1, 10^6}]; s
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Amiram Eldar, Apr 10 2022
STATUS
approved