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A167721 Squares that become prime numbers when prefixed with a 6. 1
1, 121, 361, 529, 841, 961, 1681, 2401, 4489, 5929, 6889, 8281, 11449, 16129, 17161, 17689, 24649, 28561, 29929, 32041, 34969, 39601, 43681, 48841, 57121, 61009, 63001, 64009, 67081, 73441, 85849, 96721, 100489, 116281, 117649, 124609, 137641 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Subsequence of squares of A032669. - Michel Marcus, Jun 22 2016
LINKS
MATHEMATICA
Select[Range[500]^2, PrimeQ[6 10^IntegerLength[#]+#]&] (* Harvey P. Dale, May 11 2011 *)
CROSSREFS
Cf. A032669.
Sequence in context: A203856 A216166 A208242 * A330670 A253321 A253328
KEYWORD
base,nonn
AUTHOR
Claudio Meller, Nov 10 2009
STATUS
approved

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Last modified June 19 11:49 EDT 2024. Contains 373503 sequences. (Running on oeis4.)