OFFSET
2,1
LINKS
Giovanni Resta, Table of n, a(n) for n = 2..1161
EXAMPLE
Large differences arise between max term in a cluster and least one in the next cluster of A057809. While small entries obtained as differences inside a cluster.
E.g.:...,21,6467079011,198,22,110,132,22,242,66,17541629593,23,... shows by first differences the transition from the 21st cluster to 23rd solution-set over the 22nd-set with multiples of 22.
First cluster is empty, while 11th contains one term (see A038227).
MATHEMATICA
Differences[Select[Range[2, 1500000], Divisible[#, PrimePi[#]]&]] (* Harvey P. Dale, Aug 13 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Sep 04 2003
STATUS
approved