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 A221699 Numbers with property that each sum any pair of digits is prime. 6
 11, 12, 14, 16, 20, 21, 23, 25, 29, 30, 32, 34, 38, 41, 43, 47, 49, 50, 52, 56, 58, 61, 65, 67, 70, 74, 76, 83, 85, 89, 92, 94, 98, 111, 112, 114, 116, 121, 141, 161, 203, 205, 211, 230, 250, 302, 320, 411, 502, 520, 611, 1111, 1112, 1114, 1116, 1121, 1141, 1161 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Supersequence of A091939. Subsequence of A182175. LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..145 EXAMPLE Number 203 is a term because 2+3=5, 2+0=2, 3+0=3 (primes). MATHEMATICA fQ[n_] := Module[{d = IntegerDigits[n]}, Union[PrimeQ[Plus @@@ Union[Subsets[d, {2}]]]] == {True}]; Select[Range[6000], fQ] (* T. D. Noe, Jan 24 2013 *) Select[Range[10, 1200], AllTrue[Total/@Subsets[IntegerDigits[#], {2}], PrimeQ]&] (* Harvey P. Dale, Jan 31 2024 *) CROSSREFS Cf. A172508, A091939, A182175. Sequence in context: A055100 A247849 A088134 * A227823 A332379 A140353 Adjacent sequences: A221696 A221697 A221698 * A221700 A221701 A221702 KEYWORD nonn,base AUTHOR Jaroslav Krizek, Jan 22 2013 STATUS approved

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Last modified March 3 20:15 EST 2024. Contains 370512 sequences. (Running on oeis4.)