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Search: id:A154544
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| A154544 |
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Primes n such that smallest digit of n + number of smallest digits of n = even composite. |
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+0
1
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| 3, 5, 7, 37, 43, 53, 59, 73, 79, 97, 223, 227, 229, 347, 349, 359, 367, 379, 389, 397, 439, 449, 569, 577, 587, 593, 599, 643, 653, 659, 673, 683, 739, 743, 773, 839, 853, 857, 859, 863, 883, 937, 953, 983, 1117, 1151, 1171, 1181, 1511, 1811, 2111, 2237, 2239
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OFFSET
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1,1
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EXAMPLE
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If n=3=prime and 3+1=4=even composite, then 3=a(1). If n=5=prime and 5+1=6=even composite, then 5=a(2). If n=7=prime and 7+1=8=even composite, then 7=a(3). If n=37=prime, 3<7 and 3+1=4=even composite, then 37=a(4). If m=43=prime, 4>3 and 3+1=4=even composite, then 43=a(5), etc.
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CROSSREFS
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Cf. A000040, A002808.
Sequence in context: A067232 A106115 A155034 this_sequence A087363 A037287 A163797
Adjacent sequences: A154541 A154542 A154543 this_sequence A154545 A154546 A154547
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KEYWORD
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nonn
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 11 2009
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