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A174244 Least of 4 consecutive integers such that there product +-5 are primes. 1
1, 11, 31, 61, 116, 131, 321, 336, 906, 1081, 1101, 1216, 1601, 1821, 2081, 2106, 2356, 2491, 3051, 3101, 3281, 3286, 3496, 3736, 4576, 4716, 4861, 4876, 4886, 4981, 5066, 5096, 5301, 5881, 6066, 6121, 6401, 6761, 6916, 7061, 7446, 7556, 8021, 8041, 8056 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

1*2*3*4=24+-5 -> primes,..

LINKS

Table of n, a(n) for n=1..45.

MATHEMATICA

f1[n_]:=PrimeQ[n-5]&&PrimeQ[n+5]; f2[n_]:=n*(n+1)*(n+2)*(n+3); lst={}; Do[If[f1[f2[n]], AppendTo[lst, n]], {n, 8!}]; lst

CROSSREFS

Cf. A014574, A174242, A174243

Sequence in context: A125239 A062786 A090562 * A136061 A090233 A139836

Adjacent sequences:  A174241 A174242 A174243 * A174245 A174246 A174247

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Mar 13 2010

STATUS

approved

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Last modified August 20 03:34 EDT 2017. Contains 290823 sequences.