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A116011 n+p(n)+p(p(n)) is a square, where p(n) is the n-th prime. 2
11, 106, 407, 415, 457, 5049, 11473, 13477, 15356, 18428, 19427, 20669, 27973, 39685, 40062, 45174, 58976, 60616, 66928, 93478, 105516, 108706, 113100, 118511, 139027, 163823, 170002, 178214, 184338, 206388, 217780, 222201 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
407+p(407)+p(p(407))=169^2.
MATHEMATICA
Select[Range[250000], IntegerQ[Sqrt[#+Prime[#]+Prime[Prime[#]]]]&] (* Harvey P. Dale, May 29 2013 *)
CROSSREFS
Cf. A116010.
Sequence in context: A075183 A302925 A250416 * A229070 A365775 A058715
KEYWORD
nonn
AUTHOR
Giovanni Resta, Feb 13 2006
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)