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 A108322 "Binary prime squares": a(n) = n^2 written in base 2 and interpreted as a base-10 number, if that number is prime; a(n) = 0 otherwise. 3
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1101001001, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10111110001, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 101000101001, 0, 101011111001, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1000110001001, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,29 COMMENTS Another definition: numbers having only digits 1 and 0, which, read in base 10 are primes and in base 2 are perfect squares. LINKS EXAMPLE a(5)=0 because 5^2 = 25 = 11001_2, and the decimal number 11001 is not prime. a(29)=1101001001 because 29^2 = 841 = 1101001001_2, and the decimal number 1101001001 is prime. CROSSREFS Cf. A108323, A108324, A108325. Sequence in context: A134595 A217610 A219319 * A108323 A154474 A096553 Adjacent sequences: A108319 A108320 A108321 * A108323 A108324 A108325 KEYWORD easy,nonn,base AUTHOR Alexandre Wajnberg, Jun 30 2005 EXTENSIONS Edited by Jon E. Schoenfield, Sep 23 2018 Offset corrected by Michel Marcus, Sep 24 2018 STATUS approved

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Last modified February 5 18:47 EST 2023. Contains 360087 sequences. (Running on oeis4.)