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A167722 Squares that become prime numbers when prefixed with a 7. 1
1, 9, 121, 529, 841, 1089, 1849, 3721, 4489, 4761, 5041, 5329, 6561, 7569, 8649, 9801, 10609, 12321, 17161, 23409, 28561, 32041, 32761, 33489, 39601, 45369, 49729, 51529, 54289, 61009, 62001, 63001, 66049, 69169, 71289, 76729, 88209, 94249 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For obvious reasons, all terms are odd. - Harvey P. Dale, Sep 30 2012

Subsequence of squares of A032670. - Michel Marcus, Jun 22 2016

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Range[1, 400, 2]^2, PrimeQ[FromDigits[Join[{7}, IntegerDigits[#]]]]&] (* Harvey P. Dale, Sep 30 2012 *)

CROSSREFS

Cf. A032670.

Sequence in context: A157930 A259836 A017102 * A103930 A302941 A183514

Adjacent sequences:  A167719 A167720 A167721 * A167723 A167724 A167725

KEYWORD

base,nonn

AUTHOR

Claudio Meller, Nov 10 2009

STATUS

approved

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Last modified May 31 02:51 EDT 2020. Contains 334747 sequences. (Running on oeis4.)