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Search: id:A115260
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| A115260 |
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Prime numbers in the sequence of the absolute difference of the sum of digits in odd positions and the sum of digits in even positions of prime numbers. |
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+0
3
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| 2, 3, 5, 7, 2, 7, 2, 3, 3, 2, 5, 2, 5, 2, 2, 3, 5, 7, 3, 3, 2, 2, 3, 3, 7, 5, 2, 3, 7, 2, 2, 5, 2, 5, 3, 3, 5, 7, 7, 5, 2, 5, 13, 3, 2, 3, 5, 3, 2, 7, 2, 5, 5, 7, 13, 3, 5, 2, 2, 7, 13, 3, 2, 3, 5, 17, 7, 13, 5, 3, 7, 17, 13, 7, 3, 7, 7, 2, 3, 5, 5, 2, 2, 7, 3, 3, 7, 2, 3, 7, 2, 3, 7, 2, 5, 5, 3, 2, 7, 3, 5, 7
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Primes in the sequence A115259.
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EXAMPLE
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a(37) = 3 because 37 th prime = 157, (7+1) - 5 = 3, 3 is prime.
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MAPLE
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select(isprime, [seq(abs(sum(convert(ithprime(a), base, 10)[2*i], i=1..nops(convert (ithprime(a), base, 10))/2)-sum(convert(ithprime(a), base, 10)[2*i+1], i=0..(nops (convert(ithprime(a), base, 10))-1)/2)), a=1..N)]);
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CROSSREFS
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Cf. A040997, A005017, A063792, A087593, A042939, A041000, A040164, A115259, A115261.
Sequence in context: A139752 A004088 A126051 this_sequence A143950 A108534 A039706
Adjacent sequences: A115257 A115258 A115259 this_sequence A115261 A115262 A115263
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KEYWORD
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base,nonn
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AUTHOR
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Giorgio Balzarotti, Paolo P. Lava (greenblue(AT)tiscali.it), Jan 20 2006
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