id:A134180 - OEIS Search Results

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Indices of k prime sums in A134179.

+0
2

1, 3, 5, 7, 9, 13, 23, 25, 29, 55, 117, 119, 123, 173, 187, 193, 205, 213, 223, 249, 255, 259, 265, 285, 299, 311, 329, 351, 393, 397, 411, 483, 487, 513, 515, 525, 563, 587, 597, 607, 637, 645, 647, 679, 709, 789, 871, 877, 911, 953, 971, 985, 1015, 1051, 1075 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Compute sums of k distinct sequential primes (no overlap). If the sums are prime add their indices to the sequence.`
	EXAMPLE	`a(2)=3 because this k value is the index for the next 3 primes in sequence to be summed. k=1 is 2, k=2 is 3+5, and k=3 is 7+11+13=31. The sums at k=1 and k=3 are prime, while k=2 is composite.`
	PROGRAM	`UBASIC: 10 K=1 20 A=nxtprm(A):B=B+A:C=C+1: if C<>K then 20:else 30 30 L=B/K 31 print K; B; :Q=prmdiv(B): if Q=B then print B; "-":stop:else 40 40 B=0:K=K+1:C=0:goto 20`
	CROSSREFS	`Cf. A134179 A134244 A134245 A134246.` `Adjacent sequences: A134177 A134178 A134179 this_sequence A134181 A134182 A134183` `Sequence in context: A089228 A126278 A133847 this_sequence A107220 A098758 A029608`
	KEYWORD	`easy,nonn,uned`
	AUTHOR	`Enoch Haga (Enokh(AT)comcast.net), Oct 16 2007`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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