A171669 Pell numbers sandwiched between two numbers having same number of divisors.
12, 5741, 2744210, 15994428, 21300003689580, 723573111879672, 1111984844349868137938112, 293199986221627877463941823267862, 9960168529794442859224531878561050, 27749033099085295754434173207717704165, 66992092050551637663438906713182313772
Offset: 1
Keywords
Links
- Amiram Eldar, Table of n, a(n) for n = 1..19
Programs
-
Mathematica
f[n_]:=Length[Divisors[n]]; a=1;b=0;c=0;lst={};Do[c=a+b+c;If[f[c-1]==f[c+1],AppendTo[lst,c]];a=b;b=c,{n,80}];lst
Extensions
a(8)-a(11) from Amiram Eldar, Aug 08 2024