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A273049 Palindromic primes with exactly three nonzero digits. 1
131, 151, 181, 191, 313, 353, 373, 383, 727, 757, 787, 797, 919, 929, 10301, 10501, 10601, 30103, 30203, 30403, 30703, 30803, 70207, 70507, 70607, 90709, 1003001, 1008001, 3001003, 3002003, 3007003, 9002009, 100030001, 100050001, 100060001, 300020003 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
James R. Buddenhagen and Giovanni Resta, Table of n, a(n) for n = 1..148 (terms < 10^1000, first 70 terms from J. R. Buddenhagen)
MATHEMATICA
Reap[ Do[ If[PrimeQ[p = e*(1+10^(2*n)) + m*10^n], Sow@p], {n, 99}, {e, {1, 3, 7, 9}}, {m, 9}]][[2, 1]] (* Giovanni Resta, May 14 2016 *)
PROG
(Magma) [p: p in PrimesUpTo(100000000) | #[d: d in t[1..#t]| d ne 0] eq 3 and p eq Seqint(Reverse(t)) where t is Intseq(p)]; // Bruno Berselli, May 16 2016
CROSSREFS
Subsequence of A002385.
Sequence in context: A289519 A045164 A167845 * A134951 A173071 A164294
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified May 22 19:48 EDT 2024. Contains 372758 sequences. (Running on oeis4.)