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 A089377 Numbers whose product of digits +1 and -1 gives twin prime pairs. 2
 4, 6, 14, 16, 22, 23, 26, 29, 32, 34, 36, 41, 43, 56, 61, 62, 63, 65, 67, 76, 89, 92, 98, 114, 116, 122, 123, 126, 129, 132, 134, 136, 141, 143, 156, 161, 162, 163, 165, 167, 176, 189, 192, 198, 212, 213, 216, 219, 221, 223, 231, 232, 233, 235, 237, 249, 253, 256 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 EXAMPLE 36 is a member since 3*6 = 18 and (17,19) is a twin prime pair. MATHEMATICA prodDig[n_] := Times @@ IntegerDigits[n]; Select[Range[256], And @@ PrimeQ [prodDig[#] + {-1, 1}] &] (* Amiram Eldar, Dec 27 2019 *) Select[Range[300], AllTrue[Times@@IntegerDigits[#]+{1, -1}, PrimeQ]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 26 2021 *) CROSSREFS Cf. A001097, A001359, A006512, A007954. Sequence in context: A310619 A343501 A029641 * A310620 A310621 A090773 Adjacent sequences: A089374 A089375 A089376 * A089378 A089379 A089380 KEYWORD base,nonn AUTHOR Amarnath Murthy, Nov 08 2003 EXTENSIONS More terms from David Wasserman, Sep 15 2005 STATUS approved

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Last modified June 20 23:53 EDT 2024. Contains 373535 sequences. (Running on oeis4.)