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A061120 Compute sum of divisors of the prime(n+1)-prime(n)-1 composite numbers between two consecutive primes; choose the smallest. 2
7, 12, 13, 28, 24, 39, 32, 31, 72, 48, 56, 96, 72, 57, 72, 168, 84, 96, 195, 96, 121, 108, 112, 156, 216, 162, 280, 152, 133, 176, 160, 288, 168, 372, 192, 192, 252, 183, 240, 546, 216, 508, 294, 468, 240, 252, 342, 560, 384, 288, 744, 280, 288, 304, 324, 720 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Harry J. Smith, Table of n, a(n) for n = 0..1000

FORMULA

a(n) = Min{sigma(c); p(n+1) > c > p(n)}, c is composite, p(n) is the n-th prime and sigma=A000203().

PROG

(PARI) { n=-1; q=3; m=10^6; forprime (p=5, prime(1003), a=m; for (i=q + 1, p - 1, a=min(sigma(i), a)); q=p; write("b061120.txt", n++, " ", a) ) } \\ Harry J. Smith, Jul 18 2009

CROSSREFS

Cf. A000203, A061141.

Sequence in context: A048653 A205807 A075696 * A078835 A173417 A031021

Adjacent sequences:  A061117 A061118 A061119 * A061121 A061122 A061123

KEYWORD

nonn

AUTHOR

Labos Elemer, May 29 2001

STATUS

approved

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Last modified October 23 03:21 EDT 2019. Contains 328335 sequences. (Running on oeis4.)