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 A225863 Primes for which both sum and product of digits are nonprimes. 1
 19, 37, 53, 59, 73, 79, 97, 103, 107, 109, 127, 149, 163, 167, 181, 233, 239, 251, 257, 271, 277, 293, 307, 347, 349, 367, 383, 389, 419, 431, 433, 439, 457, 479, 491, 499, 503, 509, 521, 523, 541, 547, 563, 569, 587, 613, 617, 619, 631, 653, 659, 673 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..52. EXAMPLE 79 is a member since neither 7 + 9 = 16 nor 7 * 9 = 63 is prime. MATHEMATICA d[n_]:=IntegerDigits[n]; Select[Prime[Range[122]], !PrimeQ[Plus@@(x=d[#])] && !PrimeQ[Times@@x] &] Select[Prime[Range[150]], NoneTrue[{Total[IntegerDigits[#]], Times@@ IntegerDigits[ #]}, PrimeQ]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Nov 20 2020 *) CROSSREFS Cf. A046713. Sequence in context: A332756 A245363 A109639 * A332884 A161705 A131600 Adjacent sequences: A225860 A225861 A225862 * A225864 A225865 A225866 KEYWORD nonn,base AUTHOR Jayanta Basu, May 18 2013 STATUS approved

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Last modified August 13 02:28 EDT 2024. Contains 375113 sequences. (Running on oeis4.)