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A048783 Numbers n such that prime(n) - sigma(n) - phi(n) = prime(n+1) - sigma(n+1) - phi(n+1), where sigma(n) = sum of divisors of n. 2
2, 33, 57, 62, 142, 201, 253, 302, 501, 542, 745, 877, 878, 913, 921, 1153, 1198, 1201, 1477, 1642, 1942, 1982, 2041, 2326, 2362, 2605, 2973, 3046, 3226, 3273, 3326, 3493, 3517, 3601, 3646, 3694, 3733, 3826, 3865, 3902, 4054, 4261, 4273, 4357, 4414, 4573 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
PROG
(PARI) isok(n) = (prime(n) - sigma(n) - eulerphi(n) == prime(n+1) - sigma(n+1) - eulerphi(n+1)) \\ Michel Marcus, Jul 14 2013
CROSSREFS
Sequence in context: A316736 A199551 A045932 * A116340 A003347 A303375
KEYWORD
easy,nonn
AUTHOR
STATUS
approved

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Last modified July 15 21:59 EDT 2024. Contains 374334 sequences. (Running on oeis4.)