A225892 Numbers of the form p^2 * (p^2 + 1) where p is in A225856.
20, 90, 650, 14762, 28730, 83810, 130682, 280370, 708122, 924482, 1875530, 4881890, 7893290, 12120842, 13849562, 20155610, 25416722, 28403570, 38956322, 47465210, 62750162, 88538690, 104070602, 112561490, 141170042, 163060130, 260160770, 294517082, 352294130
Offset: 1
Keywords
Examples
a(2) = 3^2(3^2+1) = 3^4+3^2 = 90. a(5) = 13^2(13^2+1) = 13^4+13^2 = 28730.
Links
- Amiram Eldar, Table of n, a(n) for n = 1..10000
Programs
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Mathematica
p = Select[Prime[Range[60]], SquareFreeQ[#^2+1]&]; p^2 * (p^2+1) #^2 (#^2+1)&/@Select[Prime[Range[50]],SquareFreeQ[#^2+1]&] (* Harvey P. Dale, Jun 17 2022 *)