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 A172069 The number of primes adjacent to A129912(n): 0, 1 or 2. 1
 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 0, 1, 1, 0, 0, 0, 1, 2, 0, 2, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 2, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 1, 1, 2, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Bill McEachen, Table of n, a(n) for n = 1..282 EXAMPLE Both 415799 and 415801 are prime, so the entry at 415800 (n=27) is a 2 (twin primes). Neither 27719 nor 27721 are prime, so the entry at 27720 (n=18) is a 0. CROSSREFS Cf. A129912. Sequence in context: A031346 A335808 A087472 * A054348 A239660 A237348 Adjacent sequences:  A172066 A172067 A172068 * A172070 A172071 A172072 KEYWORD easy,nonn AUTHOR Bill McEachen, Jan 24 2010 EXTENSIONS Offset corrected and sequence extended by R. J. Mathar, Feb 19 2010 a(1) added by T. D. Noe, Nov 11 2013 STATUS approved

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Last modified May 6 02:09 EDT 2021. Contains 343579 sequences. (Running on oeis4.)