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A030146
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Squares-of-primes in which no two adjacent digits have the same parity.
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2
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4, 9, 25, 49, 121, 169, 361, 529, 961, 12769, 16129, 18769, 32761, 72361, 76729, 78961, 96721, 212521, 214369, 436921, 452929, 458329, 1038361, 1630729, 1852321, 3892729, 5230369, 5470921, 5650129, 5812921, 5870929, 7230721
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OFFSET
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1,1
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COMMENTS
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Intersection of A030141 and A001248. - Michel Marcus, Feb 06 2015
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LINKS
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Giovanni Resta, Table of n, a(n) for n = 1..10000
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FORMULA
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a(n) = A030145(n)^2. - Giovanni Resta, Aug 16 2018
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MATHEMATICA
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Join[{4, 9}, Select[Prime[Range[4000]]^2, Union[Sort/@OddQ/@Partition[IntegerDigits[#], 2, 1]]=={{False, True}}&]] (* Harvey P. Dale, Feb 22 2011 *)
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CROSSREFS
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Cf. A030145, A030152.
Sequence in context: A280076 A052043 A188836 * A229970 A038771 A158146
Adjacent sequences: A030143 A030144 A030145 * A030147 A030148 A030149
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KEYWORD
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nonn,base
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AUTHOR
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Patrick De Geest
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EXTENSIONS
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Definition clarified by Harvey P. Dale, Feb 23 2011
Offset changed by Michel Marcus, Feb 06 2015
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STATUS
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approved
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