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Search: id:A089699
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| A089699 |
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Numbers n with property that n + 1 as well as the (product of digits of n) + 1 are primes. |
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+0
3
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| 1, 2, 4, 6, 12, 16, 22, 28, 36, 52, 58, 66, 82, 112, 126, 136, 156, 162, 166, 192, 198, 232, 256, 268, 292, 312, 316, 346, 348, 352, 366, 372, 388, 396, 438, 486, 556, 562, 568, 576, 586, 612, 616, 652, 658, 682, 732, 756, 768, 786, 796, 826, 838, 856, 862
(list; graph; listen)
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OFFSET
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1,2
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MAPLE
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for n from 1 to 150 do p:=ithprime(n): m:=mul(j, j=convert(p-1, base, 10)): if isprime(m+1) then printf("%d, ", p-1) fi od: (C. Ronaldo)
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CROSSREFS
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Cf. A089700, A089701.
Sequence in context: A090748 A032465 A089395 this_sequence A089696 A099316 A007416
Adjacent sequences: A089696 A089697 A089698 this_sequence A089700 A089701 A089702
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 10 2003
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EXTENSIONS
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Corrected and extended by C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 25 2004
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