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 A195629 Sequence with chaotic first differences: a(1)=2; a(n)=prime((prime(n) mod 10)+pi(a(n-1))). 0
 2, 7, 23, 53, 59, 71, 103, 151, 167, 223, 227, 263, 269, 281, 331, 349, 401, 409, 449, 457, 467, 541, 563, 613, 653, 659, 677, 733, 797, 821, 859, 863, 919, 983, 1039, 1049, 1093, 1109, 1171, 1193, 1259, 1277, 1279, 1291, 1327, 1429, 1433, 1451, 1489, 1559, 1579, 1627, 1637, 1657, 1709, 1733, 1801, 1811, 1873, 1877, 1901 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Sequence with chaotic first differences; minimal values a(n)-a(n-1)=2 occur when prime(n) ==1 mod 10 and a(n-1) is lesser of twin primes (and a(n) the larger of twin primes); corresponding n's are 42, 81, 109, 114, 151, 159, 166, 172, 232, 239, 334, 343, 369, 398, 431, 522, 537, 574, 584, 651, 661, 672, 763, 770, 851, 858, 869, 872, 895, 942. LINKS Table of n, a(n) for n=1..61. EXAMPLE n=2: prime(2)=3, A=(prime(n) mod 10)=3; a(n-1)=2, B=pi(a(n-1))=1; prime(A+B)=prime(3+1)=7 => a(2)=7; n=3: A=4; B=5; prime(9)=23 => a(3)=23. CROSSREFS Sequence in context: A049001 A049002 A247197 * A323526 A011757 A121963 Adjacent sequences: A195626 A195627 A195628 * A195630 A195631 A195632 KEYWORD nonn AUTHOR Zak Seidov, Sep 24 2011 EXTENSIONS Typos in sequence name and comments fixed by Zak Seidov, Nov 01 2011 STATUS approved

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Last modified September 23 12:57 EDT 2023. Contains 365551 sequences. (Running on oeis4.)