id:A130970 - OEIS Search Results

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Smallest prime p, such that |A000040(n)-p| is of the form 2^k.

+0
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3, 2, 3, 3, 3, 5, 13, 3, 7, 13, 23, 5, 37, 11, 31, 37, 43, 29, 3, 7, 41, 47, 19, 73, 89, 37, 71, 43, 101, 97, 131, 3, 73, 11, 151, 23, 29, 131, 103, 109, 163, 53, 127, 191, 181, 71, 83, 191, 163, 101, 229, 223, 113, 283, 193, 7, 13, 239, 149, 277, 251, 37, 179, 307 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(Scheme:) (define (A130970 n) (let ((p1 (A000040 n))) (let loop ((i 1)) (cond ((pow2? (abs (- p1 (A000040 i)))) (A000040 i)) (else (loop (+ i 1)))))))` `(define (pow2? n) (and (> n 0) (zero? (A004198bi n (- n 1)))))`
	CROSSREFS	`Cf. A130971.` `Sequence in context: A065801 A086920 A117451 this_sequence A144733 A091460 A035093` `Adjacent sequences: A130967 A130968 A130969 this_sequence A130971 A130972 A130973`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen (His-Firstname.His-Surname(AT)gmail.com), Jun 19 2007`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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