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A067625 Numbers n such that sigma(n)=phi(prime(n)+1). 1
23, 51, 77, 87, 114, 154, 158, 184, 210, 308, 552, 690, 786, 1330, 1848, 2030, 2280, 2868, 2976, 3432, 8680, 10290, 11556, 12750, 13110, 26400, 56808, 57960, 62496, 136290, 170478, 608580 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

PROG

(PARI) a067625(m) = for(n=1, m, if(sigma(n)==eulerphi(prime(n)+1), print1(n, ", ")))

CROSSREFS

Sequence in context: A185187 A157095 A165432 * A140689 A172034 A113912

Adjacent sequences:  A067622 A067623 A067624 * A067626 A067627 A067628

KEYWORD

nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 23 2002

EXTENSIONS

More terms from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 02 2002

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Last modified February 16 05:32 EST 2012. Contains 205860 sequences.