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A078203
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Numbers n such that A004154(n) + 1 is prime.
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4
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1, 2, 3, 5, 6, 14, 15, 24, 74, 191, 222, 276, 2200
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MATHEMATICA
| f[n_] := n!/10^Sum[ Floor[n/5^k], {k, 1, Log[10, n] + 1}]; Do[ If[ PrimeQ[ f[n] + 1], Print[n]], {n, 1, 850}]
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CROSSREFS
| Cf. A004154, A078154, A078190, A078305.
Sequence in context: A098833 A075371 A057704 * A131825 A079226 A055686
Adjacent sequences: A078200 A078201 A078202 * A078204 A078205 A078206
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KEYWORD
| nonn,base
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AUTHOR
| Cino Hilliard (hillcino368(AT)gmail.com), Dec 23 2002
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EXTENSIONS
| Extended by Joshua Zucker, Robert G. Wilson v (rgwv(AT)rgwv.com) and Jason Earls (zevi_35711(AT)yahoo.com), Dec 24 2002
"2200" from Don Reble (djr(AT)nk.ca), Jan 12 2006
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