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A086470 Terms of A086469 for which psigma(n) = psigma(n+1). 1
9, 21, 33, 44, 57, 93, 141, 169, 177, 201, 213, 258, 381, 393, 426, 453, 501, 537, 633, 670, 678, 717, 762, 921, 933, 1041, 1137, 1266, 1293, 1317, 1401, 1437, 1590, 1641, 1686, 1713, 1761, 1821, 1857, 1893, 1941, 1990, 2181, 2217, 2361, 2433, 2509, 2517 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

If n =3p and n+1 = 2q where p and q are primes then n is a member.

LINKS

Table of n, a(n) for n=0..47.

EXAMPLE

9 is a member as psigma(9) = 1+3 +9 = psigma(10) = 1+2 +10 = 13.

CROSSREFS

Cf. A086469.

Sequence in context: A110701 A243703 A133929 * A176256 A017629 A216240

Adjacent sequences:  A086467 A086468 A086469 * A086471 A086472 A086473

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Jul 21 2003

EXTENSIONS

Corrected and extended by David Wasserman, Mar 07 2005

STATUS

approved

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Last modified November 23 21:46 EST 2017. Contains 295141 sequences.