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A283598 Numbers n such that all three of 6*n+1, 6*(n+1)+1, and 6*(n+2)+1 are semiprimes. 0
41, 42, 48, 84, 92, 148, 157, 158, 162, 189, 209, 210, 222, 223, 224, 225, 226, 234, 250, 306, 315, 316, 317, 318, 319, 326, 386, 387, 401, 407, 408, 433, 462, 487, 488, 489, 514, 515, 521, 532, 539, 566, 567, 568, 569, 580, 598, 633, 634, 662, 663, 664, 672, 697, 713, 717, 718 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

That is, n, n+1 and n+2 are terms in A112775.

LINKS

Table of n, a(n) for n=1..57.

MATHEMATICA

po[x_]=PrimeOmega[x]; Select[Range[1000], po[6*#+1]==po[6*(1+#)+1]== po[6*(2+#)+1==2 &]

CROSSREFS

Subsequence of A283597 and A112775.

Cf. A112771, A001358.

Sequence in context: A191754 A165862 A077680 * A041839 A098064 A073921

Adjacent sequences:  A283595 A283596 A283597 * A283599 A283600 A283601

KEYWORD

nonn

AUTHOR

Zak Seidov, Mar 14 2017

STATUS

approved

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Last modified November 19 22:34 EST 2019. Contains 329323 sequences. (Running on oeis4.)