A338537 Numbers that occur more than once in A338529.

4320, 23142, 301310, 333414, 340352, 375650, 553520, 644490, 910872, 921730, 1133670, 1366090, 1422650, 1440138, 1650350, 1705070, 1751970, 1874430, 2091850, 2180768, 2852640, 3213780, 3438548, 3676320, 4044732, 4444662, 4682000, 4854274, 4863754, 5101914, 5384106, 6011250, 6309860, 6551688

Offset: 1

Author

J. M. Bergot and Robert Israel, Nov 01 2020

Keywords

• nonn

Comments

Does any number occur more than twice in A338529?

Examples

			a(3) = 301310 is in the sequence because A338529(1618) = A338529(2414) = 301310.
		

Links

• Robert Israel, Table of n, a(n) for n = 1..609

Crossrefs

Cf. A338529.

Programs

Maple

A338529:= [seq(ithprime(n+2)*ithprime(n+3)-ithprime(n)*ithprime(n+1), n=1..100000)]):
M:= 12*ithprime(100000):
V:= Vector(M,datatype=integer[4]):
R:= NULL:
for i from 1 to 100000 do
  v:= A338529[i];
  if v <= M then V[v]:= V[v]+1; if V[v] > 1 then R:= R, v fi fi
od:
sort([R]);