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 A117819 Final digit d of n is in the sequence iff d is prime or n is prime. 1
 2, 3, 5, 7, 1, 2, 3, 5, 7, 9, 2, 3, 5, 7, 9, 1, 2, 3, 5, 7, 1, 2, 3, 5, 7, 2, 3, 5, 7, 9, 1, 2, 3, 5, 7, 1, 2, 3, 5, 7, 9, 2, 3, 5, 7, 9, 2, 3, 5, 7, 1, 2, 3, 5, 7, 9, 2, 3, 5, 7, 2, 3, 5, 7, 1, 2, 3, 5, 7, 9, 2, 3, 5, 7, 9, 1, 2, 3, 5, 7, 2, 3, 5, 7, 2, 3, 5, 7, 9, 1, 2, 3, 5, 7, 1, 2, 3, 5, 7, 9, 2, 3, 5, 7, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE Calculations: n: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... d: - 2 3 - 5 - 7 - - -- -1 -2 -3 -- -5 -- -7 -- -9 -- ... MATHEMATICA Table[If[PrimeQ[n]||PrimeQ[Mod[n, 10]], Mod[n, 10], Nothing], {n, 300}] (* Harvey P. Dale, Oct 03 2016 *) PROG (PARI) for(n=1, 211, if(isprime(d=n%10)||isprime(n), print1(d, ", "))) CROSSREFS Cf. A118385. Sequence in context: A228355 A065859 A258062 * A074461 A285095 A073342 Adjacent sequences:  A117816 A117817 A117818 * A117820 A117821 A117822 KEYWORD base,easy,nonn AUTHOR Giovanni Teofilatto, Apr 30 2006 EXTENSIONS Edited, corrected and extended by Klaus Brockhaus, May 02 2006 STATUS approved

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Last modified August 3 10:49 EDT 2020. Contains 336198 sequences. (Running on oeis4.)