id:A134100 - OEIS Search Results

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Primes following odd numbers not preceded by primes.

+0
5

29, 37, 53, 59, 67, 79, 89, 97, 127, 137, 149, 157, 163, 173, 179, 191, 211, 223, 239, 251, 257, 263, 269, 277, 293, 307, 331, 337, 347, 359, 367, 373, 379, 389, 397, 409, 419, 431, 439, 449, 457, 479, 487, 499, 509, 521, 541, 547, 557, 563, 569, 577, 587 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(1)=29 because 29 follows the odd nonprime 27 which in turn follows the odd nonprime 25`
	PROGRAM	`UBASIC: 10 'primes using counters 20 N=3:print "2 "; :print "3 "; :C=2 30 A=3:S=sqrt(N) 40 B=N\A 50 if B*A=N then 55 55 Q=N-2:R=N+2: if Q<>prmdiv(Q) and N<>prmdiv(N) and R=prmdiv(R) then print Q; N; R; "-"; :stop:else N=N+2:goto 30 60 A=A+2 70 if A<=sqrt(N) then 40:stop 81 C=C+1 100 N=N+2:goto 30`
	CROSSREFS	`Cf. A134099 A083370 A124582 A007510 A134101.` `Adjacent sequences: A134097 A134098 A134099 this_sequence A134101 A134102 A134103` `Sequence in context: A046502 A049746 A097997 this_sequence A060769 A031925 A107134`
	KEYWORD	`easy,nonn`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net), Oct 08 2007`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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