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Search: id:A107794
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| A107794 |
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Numbers n such that both n plus its first digit and n minus its first digit are primes. |
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+0
1
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| 12, 18, 21, 34, 65, 67, 81, 92, 98, 102, 108, 138, 150, 180, 192, 198, 225, 231, 279, 310, 314, 334, 350, 356, 370, 376, 386, 405, 435, 453, 483, 495, 504, 552, 582, 607, 613, 625, 637, 647, 653, 667, 726, 750, 780, 819, 831, 920, 928, 938, 962, 1020, 1032, 1050
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Average of pairs: 66,3255,3465,6696,6786,6954,9429,31725,34845,60096,...
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MATHEMATICA
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Select[ Range[1060], PrimeQ[ # + IntegerDigits[ # ][[1]]] && PrimeQ[ # - IntegerDigits[ # ][[1]]] &]
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CROSSREFS
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Intersection of A107835 & A107836.
Sequence in context: A091191 A071927 A031207 this_sequence A162151 A056773 A136446
Adjacent sequences: A107791 A107792 A107793 this_sequence A107795 A107796 A107797
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KEYWORD
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base,nonn
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AUTHOR
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Eric Angelini (eric.angelini(AT)kntv.be) and Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 14 2005
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