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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

Table of n, a(n) for n=1..32.

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 A058715 A140617

Adjacent sequences:  A116008 A116009 A116010 * A116012 A116013 A116014

KEYWORD

nonn

AUTHOR

Giovanni Resta, Feb 13 2006

STATUS

approved

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Last modified June 15 04:47 EDT 2021. Contains 345043 sequences. (Running on oeis4.)