OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
The first pair of consecutive odd primes is 3,5, with average = 4 and tau(4) = 3. Hence a(1) = 3. The second pair of consecutive odd primes is 5,7, with average = 6 and tau(6) = 4, so a(2) = 4.
MATHEMATICA
Table[DivisorSigma[0, (Prime[i] + Prime[i + 1])/2], {i, 2, 101}]
DivisorSigma[0, #]&/@(Mean/@Partition[Prime[Range[2, 100]], 2, 1]) (* Harvey P. Dale, Jul 06 2021 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Joseph L. Pe, Jan 11 2003
STATUS
approved