

A179232


Numbers in A075728 which are not one less than some prime.


1



120, 186, 264, 450, 504, 552, 696, 978, 1208, 1440, 1444, 1848, 2034, 2744, 4320, 4410, 5376, 6888, 7020, 9264, 9968, 10944, 10989, 13952, 16080, 19152, 23160, 29280, 31410, 34464, 38928, 39648, 49544, 56880, 60480, 67266, 73200, 78480, 82800, 91440, 102312
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OFFSET

1,1


COMMENTS

The first 30 terms of A075728 are equal to prime(k)1 for some k. The first term here, n = 120, satisfies sigma(n)  2*n = n.  Michel Marcus, Nov 02 2013


LINKS

Donovan Johnson, Table of n, a(n) for n = 1..1000


FORMULA

A075728 \ A006093.


PROG

(PARI) lista(nn) = {rec = 1; for (n=1, nn, d = abs(sigma(n)  2*n); if (d > rec, if (! isprime(d+1), print1(d, ", ")); rec = d; ); ); } \\ Michel Marcus, Nov 02 2013


CROSSREFS

Cf. A006093, A075728.
Sequence in context: A337479 A322377 A247851 * A056994 A288461 A114823
Adjacent sequences: A179229 A179230 A179231 * A179233 A179234 A179235


KEYWORD

nonn


AUTHOR

Artur Jasinski, Jul 04 2010


EXTENSIONS

More terms from R. J. Mathar, Jul 05 2010
Anumber typo corrected by R. J. Mathar, Jul 16 2010


STATUS

approved



