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A051896 a(n) = smallest palindrome > a(n-1) such that a(1)*a(2)*...*a(n) + 1 is prime with a(1) = 2. 4
2, 3, 5, 6, 9, 55, 66, 77, 88, 161, 191, 313, 484, 494, 525, 747, 3223, 3993, 11711, 13431, 13731, 18881, 19691, 21012, 21112, 22422, 24242, 34443, 35353, 41114, 44244, 44844, 46664, 52225, 52925, 53935, 58385, 59895, 60806, 64146, 71917 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
nxt[{t_, a_}]:=Module[{k=a+1}, While[(!PalindromeQ[k])||CompositeQ[k*t+1], k++]; {t*k, k}]; NestList[nxt, {2, 2}, 40][[All, 2]] (* Harvey P. Dale, Apr 18 2022 *)
CROSSREFS
Subsequence of A002113.
Sequence in context: A055690 A108861 A294634 * A061939 A029503 A133139
KEYWORD
easy,nice,nonn,base
AUTHOR
Felice Russo, Dec 21 1999
EXTENSIONS
Initial conditions added to description by Chai Wah Wu, Apr 16 2021
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)