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 A204578 Primes of the form 5^k-2. 1
 3, 23, 6103515623, 1490116119384765623, 88817841970012523233890533447265623, 11754943508222875079687365372222456778186655567720875215087517062784172594547271728515623, 44841550858394146269559346665277316200968382140048504696226185084473314645947539247572422027587890623 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See the sequence A109080 for the corresponding exponents k. The number a(3) = 6103515623 is also in A095304, A104090 and A128472. LINKS Table of n, a(n) for n=1..7. FORMULA a(n) = 5^A109080(n)-2. PROG (PARI) for(i=0, 999, ispseudoprime(t=5^i-2) & print1(t", ")) CROSSREFS Cf. A109080. Sequence in context: A352333 A355960 A264929 * A120085 A062834 A047980 Adjacent sequences: A204575 A204576 A204577 * A204579 A204580 A204581 KEYWORD nonn,less AUTHOR M. F. Hasler, Jan 30 2012 STATUS approved

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Last modified May 23 08:52 EDT 2024. Contains 372760 sequences. (Running on oeis4.)