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A030146 Squares-of-primes in which no two adjacent digits have the same parity. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Intersection of A030141 and A001248. - Michel Marcus, Feb 06 2015

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A030145(n)^2. - Giovanni Resta, Aug 16 2018

MATHEMATICA

Join[{4, 9}, Select[Prime[Range[4000]]^2, Union[Sort/@OddQ/@Partition[IntegerDigits[#], 2, 1]]=={{False, True}}&]] (* Harvey P. Dale, Feb 22 2011 *)

CROSSREFS

Cf. A030145, A030152.

Sequence in context: A280076 A052043 A188836 * A229970 A038771 A158146

Adjacent sequences:  A030143 A030144 A030145 * A030147 A030148 A030149

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

EXTENSIONS

Definition clarified by Harvey P. Dale, Feb 23 2011

Offset changed by Michel Marcus, Feb 06 2015

STATUS

approved

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Last modified June 26 10:50 EDT 2022. Contains 354881 sequences. (Running on oeis4.)