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 A143390 Numbers in which every suffix (in base 10) is 1 or a prime. 5
 1, 2, 3, 5, 7, 11, 13, 17, 23, 31, 37, 41, 43, 47, 53, 61, 67, 71, 73, 83, 97, 101, 103, 107, 113, 131, 137, 167, 173, 197, 211, 223, 241, 271, 283, 307, 311, 313, 317, 331, 337, 347, 353, 367, 373, 383, 397, 401, 431, 443, 461, 467, 503, 523, 541, 547, 571, 601 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Subsequence of A042986 apart from first term; a(n+1)=A042986(n) for n<25. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..1000 MATHEMATICA prQ[n_] := n == 1 || PrimeQ[n]; okQ[n_] := Module[{dd = IntegerDigits[n]}, AllTrue[Range[Length[dd]-1], prQ@ FromDigits@ Drop[dd, #]&]]; {1}~Join~Select[ Prime@Range[1000], okQ] (* Jean-François Alcover, Nov 20 2019 *) PROG (PARI) is(n)=my(d=digits(n, 10)); for(i=1, #d-1, if(!isprime(fromdigits(d[i..#d], 10)), return(0))); isprime(d[#d]) || d[#d]==1 \\ Charles R Greathouse IV, Nov 26 2016 CROSSREFS Cf. A012883, A012884. Sequence in context: A040065 A051647 A042986 * A038617 A036962 A160337 Adjacent sequences:  A143387 A143388 A143389 * A143391 A143392 A143393 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Aug 13 2008 STATUS approved

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Last modified May 17 18:17 EDT 2021. Contains 343986 sequences. (Running on oeis4.)